Trying to conceive: when to get checked

Most couples having regular sex without contraception conceive within a year. That is the fact everything else sits on, and it is worth holding onto, because the months in between are where the worry lives.

The useful question is not “are we infertile”. It is “at what point does waiting stop being sensible and start being a delay?” There is a reasonably clear answer, and it turns on two things: your age, and whether anything already in your history points at a problem.

The World Health Organization estimates that around one in six adults worldwide experience infertility at some point in their lives. It is common, much of it is treatable, and most of the genuinely valuable work happens at the assessment stage rather than in any dramatic intervention.

When to get checked

Two things about that first row. “Regular unprotected sex” means roughly every two to three days across the whole cycle — not intercourse saved up for a day an app has nominated. And the 12-month clock starts when you began trying, not when you started worrying. If you have been at it for fourteen months and counted from the wrong point, you are already past the line.

The thresholds are not arbitrary. They sit close to what NICE guidance recommends in the UK, and they broadly match how fertility services work elsewhere.

Why age changes the maths

Two separate things shift with age, and they compound. The number of eggs remaining falls, which lowers the chance of conceiving in any given month. Egg quality also falls, which raises the miscarriage rate. The decline is gradual through the early thirties, steeper from the mid-thirties, and steeper again after forty.

There is a third, more practical factor that gets less attention: investigation itself takes time. Bloods have to be taken at particular points in the cycle. An abnormal semen analysis is usually repeated around three months later. Tubal imaging has to be scheduled. Three to six months can pass between “let’s look into this” and “here is what we found” without anybody being slow. At 33 that matters little. At 39 it matters a great deal — which is precisely what the six-month threshold is buying back. It is not a prediction of failure.

None of this sets a date on anything. Plenty of people conceive naturally at 41. Age changes the probability per month and the urgency of looking, not the possibility.

Timing sex without letting it take over

The fertile window is about six days long: the five days before ovulation, plus the day of it. The two best days are the day before ovulation and the day of it. An egg survives roughly 24 hours after release; sperm can survive several days in fertile cervical mucus, which is why the window opens before ovulation rather than after.

Sex every two to three days across the cycle covers that window without anyone needing to know when it is. For most couples with reasonably regular cycles, this is about as effective as careful timing and considerably easier to live with.

If you do want to track, it helps to know what each method can and cannot tell you:

• Urine LH tests detect the hormone surge roughly 24 to 36 hours before ovulation, so they give warning rather than confirmation. Most useful when cycles are unpredictable. They can miss a short surge, and in PCOS a chronically raised LH can produce repeated positives that mean nothing.
• Basal body temperature rises after ovulation. It confirms ovulation happened but is always too late to act on. Useful across two or three months for spotting a pattern; useless as a daily instruction.
• Cervical mucus turning clear, slippery and stretchy is a genuinely good real-time sign, costs nothing, and takes a couple of cycles to learn to read.
• Calendar-based app predictions are only as good as the regularity of your cycles. If yours vary by more than a few days, the app is guessing.

Sex every two or three days across the whole cycle gives you much the same chance as careful ovulation timing, without the stopwatch. If tracking has turned sex into a scheduled clinical procedure, you have permission to stop tracking.

That is not a throwaway line. A good number of people find tracking gives them a sense of control; a good number find it does the exact opposite and converts a relationship into a monthly performance review. Both responses are normal. Knowing which one is yours is more useful than any app.

What a first workup actually involves

A proper assessment looks at both partners from the start. Investigating her first and him three months later is the commonest way six months quietly disappear.

Cycle history. The most informative part of the whole assessment, and it costs nothing. Length, regularity, how long that pattern has held, previous pregnancies, contraception history, pelvic pain, pain with sex, past infections or surgery. If your cycles run consistently between about 24 and 35 days, you are very probably ovulating.

Mid-luteal progesterone. A blood test confirming ovulation, taken seven days before your period is due — not automatically “day 21”. On a 35-day cycle the right day is 28. On a 24-day cycle it is 17. Timed wrong, a perfectly normal result reads as abnormal, and people get investigated for a problem they do not have.

Ovarian reserve — AMH and antral follicle count. Worth being precise about, because these two numbers cause more distress than anything else in fertility medicine. AMH and the antral follicle count estimate how many eggs are available to respond to stimulation. They predict how your ovaries are likely to behave in an IVF cycle. They are a poor predictor of whether you will conceive naturally this year. A low AMH in someone ovulating regularly does not mean you cannot conceive; a reassuring AMH at 41 does not undo what age has done to egg quality. Ask what the number is being used for before you let it mean anything.

Thyroid and prolactin. Checked where cycles are irregular or absent, or where there are suggestive symptoms. Both are treatable causes of disrupted ovulation, and both get missed because their symptoms are unremarkable on their own.

Rubella immunity and a chlamydia screen. Rubella because the vaccine has to be given before pregnancy, not during it. Chlamydia because past infection is a common cause of tubal damage and very often caused no symptoms at all.

Tubal assessment, usually once a semen analysis is back and ovulation is established:

If you recognise the symptom pattern described in the early signs of endometriosis, say so before tubal testing is booked, because it changes which test is appropriate. If your cycles are long or unpredictable, what a PCOS diagnosis actually means is the more relevant starting point.

Semen analysis — the test that gets skipped

Male factors contribute in a large share of cases: by most estimates somewhere around a third to a half, either alone or alongside a female factor. Semen analysis is inexpensive, non-invasive and quick, and it should be arranged at the same time as your bloods rather than after everything else has been exhausted.

Two practical points. Abstinence of two to seven days before the sample keeps the result interpretable. And a single abnormal result should be repeated, usually about three months later, before anyone draws conclusions — sperm production runs on roughly a three-month cycle, so a fever, a heavy illness or a punishing month can depress one sample and not the next.

A confirmed abnormal result is a finding, not a verdict. It points towards a urology assessment, sometimes towards a correctable cause, and it changes which treatments are worth considering.

Pre-conception basics worth doing now

• Folic acid, 400 micrograms daily, ideally started before conception and continued through the first 12 weeks. A higher 5 mg dose is advised in specific situations — diabetes, certain epilepsy medicines, a higher BMI, a previous pregnancy affected by a neural tube defect, sickle cell disease or thalassaemia. That is a prescribing decision, not a supermarket one.
• Vitamin D, 10 micrograms (400 IU) daily, in line with standard UK advice while trying and in pregnancy.
• Rubella immunity. If you are not immune, MMR needs to be given before pregnancy, with conception avoided for a month afterwards.
• Smoking. Both partners. It reduces fertility in both and raises miscarriage risk. Of everything on this list, stopping has the clearest return.
• Alcohol. The safest level in pregnancy is none, and cutting back while trying is sensible for both of you.
• Weight. Being significantly under or over weight can disrupt ovulation. In PCOS particularly, a modest and sustained change is often enough to restore it — the target is ovulation, not a dress size.
• Medication review. Some common medicines are unsafe in early pregnancy, including isotretinoin, sodium valproate, methotrexate and ACE inhibitors. Never stop an essential medicine on your own; have it reviewed and switched properly.
• Cervical screening up to date before you conceive, since routine screening is usually deferred during pregnancy.

When to seek urgent or same-day care

Most of this is unhurried. These are not.

• A positive pregnancy test with one-sided pelvic pain, shoulder-tip pain, bleeding, faintness or dizziness. Same day, without exception — this can be an ectopic pregnancy.
• Sudden severe pelvic pain, particularly with nausea or vomiting — possible ovarian torsion or cyst rupture.
• During ovulation induction or IVF: rapid abdominal swelling, sharp weight gain over a few days, breathlessness, or passing far less urine than usual — possible ovarian hyperstimulation.
• Fever with pelvic pain and abnormal discharge — possible pelvic infection, which needs treating promptly to protect the tubes.
• Bleeding soaking a pad or tampon every hour for several hours, or bleeding with dizziness or breathlessness.
• Sudden severe testicular pain or swelling in your partner — a surgical emergency, assessed within hours.
• Any bleeding after the menopause, which is always investigated. We cover that in postmenopausal bleeding.

Not emergencies, but do not sit on them: periods that have stopped for three months or more when you are not pregnant or breastfeeding, and two or more miscarriages.

Where the picture is honestly uncertain

Roughly a quarter of couples investigated for infertility end up labelled “unexplained” — every test normal, still no pregnancy. That label is honest, and it is also an admission. Our tests measure ovulation, tubal patency and sperm parameters reasonably well. They do not measure egg quality, fertilisation, or implantation, which is where a good deal of the real difficulty sits. Unexplained does not mean nothing is wrong, and it certainly does not mean it is psychological.

What would change the picture: a confirmed abnormal semen analysis on repeat, a progesterone showing you are not ovulating, a blocked tube, or a symptom pattern pointing at endometriosis firmly enough to justify a laparoscopy. Any one of those moves you from waiting to acting, which is the entire point of testing rather than hoping.

The wait itself

Nobody warns you that trying to conceive runs on a monthly emotional cycle of its own: hope building through the second half, a very particular kind of disappointment, then a reset. Repeated over a year or two, that is genuinely wearing, and it is not a failure of attitude.

A few things help. Tell at least one person outside the relationship. Expect that you and your partner will rarely be at the same point on the same day, and that this is ordinary rather than evidence of unequal investment. Agree in advance what you will say when someone asks at a wedding. And if the strain is reaching your sleep, your work or your relationship, counselling from someone who works with fertility is a reasonable and unremarkable thing to arrange — most fertility services can point you to it.

What a consultation would actually cover

A first fertility appointment at HeliosCheck.com is mostly history, because history is usually where the answer is. Expect to go through how long you have been trying and from when, your cycle pattern over the past year, previous pregnancies and their outcomes, pelvic pain or pain with sex, past infections and surgery, your medicines, and your partner’s history — including anything about undescended testes, testicular surgery or previous samples.

From there we agree a short list of tests with a reason attached to each and, crucially, when in your cycle to take them. Tests done on the wrong day are the commonest avoidable source of confusion in fertility care. We arrange them locally and then go through the results with you rather than emailing a PDF. How it works sets out that pathway, and fertility support covers what falls inside this service.

We will also be plain about the limits. An online consultation cannot perform a physical or internal examination, cannot scan you, and cannot take the samples. Where an examination, an ultrasound or tubal imaging is needed, that is said directly and arranged, not worked around. There is also a point at which the right advice is referral into a fertility unit for treatment, and HeliosCheck.com will tell you when you have reached it rather than keeping you in review indefinitely. If it helps to see the wider range of conditions we cover first, that is a reasonable place to start, and our consultations page explains the format.

This article is general information, not a diagnosis. No article can assess your individual situation, and no online consultation can examine you.