Choosing contraception: matching a method to your life

Most contraception conversations begin in the wrong place — with a ranking. Which one is best, which is safest, which would you choose. There is no answer to that, because the methods are not competing on a single axis. They differ in how often you have to think about them, what they do to your bleeding, how fast fertility returns afterwards, and what else they happen to treat along the way.

The useful question is narrower: which method fits the next few years of my life, given my medical history. A 24-year-old who forgets things, would rather not bleed, and may want to conceive in three years is working from a different shortlist than a 43-year-old with heavy periods and migraine with aura — even though both shortlists are drawn from the same eight or nine options.

What follows is the comparison we actually work through at HeliosCheck.com: the families of method side by side, the medical facts that genuinely remove options rather than merely complicate them, and what usually settles by three months versus what means the method is wrong.

The main families, side by side

Effectiveness gets quoted two ways. Perfect use is what happens when nothing goes wrong. Typical use is what happens in real life, with late pills, a missed appointment and a condom applied halfway through. Typical use is the number worth reading, and for anything fitted or implanted the two figures are nearly identical — because there is nothing left to get wrong. The figures below follow the standard effectiveness tables published by the CDC and WHO.

The shape of that table is the most useful thing on this page. The methods you cannot forget all work about equally well, and the gap between an implant and a coil is trivial next to the gap between an implant and a pill.

Nearly all the real-world difference in effectiveness comes from how much a method depends on you remembering it. Choosing between two long-acting methods is mostly about bleeding and preference. Choosing between a pill and a long-acting method is about effectiveness.

What genuinely narrows the choice

Clinicians do not decide eligibility by instinct. There are published frameworks — UKMEC in the UK, the US MEC from the CDC, both derived from WHO’s medical eligibility criteria — that grade every method against every relevant condition on a four-point scale. Category 1 means no restriction; 2 means benefits generally outweigh risks; 3 means risks generally outweigh benefits and needs careful specialist judgement; 4 means an unacceptable health risk, and the method is not used.

Almost everything in category 3 or 4 relates to oestrogen, which is why the restrictions cluster on the combined pill, patch and ring, and why progestogen-only and copper options stay open for most people:

• Migraine with aura — combined hormonal contraception is not used at any age, because of the stroke risk. Progestogen-only methods and the copper coil are unaffected. Aura that appears for the first time while on the combined pill means stopping it.
• Blood pressure — consistently raised readings restrict combined methods. This is one reason a current BP is asked for before a combined pill is issued.
• Venous thromboembolism — a personal history of DVT or pulmonary embolism, a known thrombophilia, or major surgery with prolonged immobility rules out oestrogen-containing methods.
• Smoking over 35 — heavier smoking at that age is a category 4 for combined methods; lighter smoking is category 3. Under 35 it is not a bar.
• Current breast cancer — hormonal methods are avoided; the copper coil remains an option. A past breast cancer needs individual specialist input rather than a rule.
• Breastfeeding — progestogen-only methods and the copper coil can be started straight after birth. Combined methods are usually deferred, mainly for thrombosis risk in the early postpartum weeks.
• Enzyme-inducing medication — some anticonvulsants (carbamazepine, phenytoin and others), rifampicin and St John’s wort speed up hormone clearance and make pills, the patch, the ring and the implant less reliable. The injection, hormonal coil and copper coil are unaffected, which is why they become the sensible shortlist. The interaction also runs the other way: combined hormonal contraception lowers lamotrigine levels.

Age, BMI, migraine without aura, lupus, diabetes and liver disease all appear in the criteria too, more often as category 2 or 3 than as outright exclusions. If you have a condition we cover in conditions we treat, it is worth naming it before you settle on a method rather than after.

When contraception is also doing a second job

For a lot of people the deciding factor is not contraception at all.

• Heavy periods. The hormonal coil is recommended as a first-line medical treatment for heavy menstrual bleeding, not merely as contraception that happens to help — NICE guidance covers the long-acting methods in detail. If this is your situation, our article on heavy periods and when to worry covers the assessment that should come first.
• Acne and unwanted hair. Combined pills reliably improve both for many people, with some progestogens better than others.
• Endometriosis pain. A continuous combined pill, taken without a break, or a hormonal coil can substantially reduce pain by reducing bleeding. Our piece on early signs of endometriosis explains why the diagnosis often takes so long.
• Perimenopause. Erratic, heavy cycles in the forties often respond well to a combined pill, which can usually be continued to 50 if there is no reason to avoid oestrogen. A hormonal coil can supply the progestogen part of HRT while also handling contraception — still needed until 55, or two years after the last period under 50. See early perimenopause symptoms.

The first three months, and what should not be tolerated

Almost every hormonal method produces some unscheduled bleeding at the start. On the implant, the progestogen-only pill and the coil, spotting in the first three to six months is expected and usually improves. Breast tenderness, mild nausea and cramping after a coil fitting follow the same pattern.

What should not be waited out:

• New migraine with aura on a combined method — stop it and get advice promptly.
• Bleeding still disruptive at six months. It is worth investigating rather than enduring, and a different method may behave completely differently.
• A clear, sustained deterioration in mood that began with the method. The evidence linking hormonal contraception to depression is genuinely mixed and inconsistent between studies, so nobody can tell you with confidence whether it is causal in your case — but a trial off it, or a switch, is a reasonable way to find out.
• Persistent pelvic pain or fever after a coil fitting, or threads you can no longer feel.

Be honest with your clinician about how many pills you actually missed last month. Effectiveness advice is built on that number, and a method you cannot take consistently is not a safe method — it is a method that has not failed yet.

Emergency contraception and its windows

Three options exist, and they are not interchangeable.

Both pills work mainly by delaying ovulation, so they are less effective the closer you already are to it — and neither ends an established pregnancy. The NHS emergency contraception pages set out where to get each at short notice.

STI protection is a separate question

No coil, implant, injection or pill offers any protection against sexually transmitted infection. That is not a shortcoming of those methods; it is simply a different problem with a different solution. Condoms are the only contraceptive that addresses both, and for many people the sensible answer is a long-acting method for pregnancy and condoms for infection — plus testing when partners change. Treat these as two decisions, not one.

When to seek urgent or same-day care

• Sudden severe headache, weakness, numbness, slurred speech or visual loss — emergency assessment, whatever method you are on.
• Calf pain or swelling, chest pain, breathlessness or coughing blood — possible clot; emergency assessment.
• Severe one-sided abdominal pain with a late or missed period, especially with a coil in place or on a progestogen-only pill — ectopic pregnancy must be excluded the same day.
• Fever, pelvic pain or offensive discharge in the weeks after a coil fitting — same-day review.
• Heavy bleeding with dizziness, breathlessness or fainting.
• Jaundice, or severe abdominal pain that does not settle.
• A coil you cannot feel the threads of — use condoms and arrange a check promptly; it is not an emergency, but it is not something to leave.

What a consultation would actually cover

A contraception appointment at HeliosCheck.com spends most of its time on two things: what you need the method to do, and what your history allows. We go through your cycle and how much the bleeding bothers you, pregnancy plans and their timing, migraine and its type, blood pressure, clot and cancer history, smoking, breastfeeding, and every medication and supplement — including anything bought over the counter, since that is where St John’s wort usually hides.

We are clear about the limits. An online consultation cannot perform a physical or internal examination, cannot fit or remove a coil or implant, and cannot take your blood pressure — so where a reading, an examination or a fitting is required, we say so and arrange it. How it works sets out that pathway.

What you should leave with is a shortlist rather than a single instruction: two or three methods that are genuinely open to you, an honest account of what each will probably do to your bleeding, a start date and what to use in the meantime, and a review point at three months where changing your mind is treated as information, not failure.