Can you still get pregnant in perimenopause?

Yes. And this is the single most common piece of misinformation in the whole category — usually not stated outright, just quietly implied by everything else.

Periods becoming unpredictable feels like the door closing. It isn't. Irregular ovulation is still ovulation, and an unpredictable cycle is harder to read, not safer.

The numbers

The Faculty of Sexual and Reproductive Healthcare — the UK body whose guidance GPs follow on this — puts the chance of pregnancy from unprotected sex over the course of a year at around 10 to 20% for women aged 40 to 44, and closer to 12% for women aged 45 to 49.

Those are not rounding errors. Spontaneous pregnancy is rare after 50, but "rare after 50" and "unlikely in your forties" are very different claims.

The FSRH's position is plain: although fertility declines naturally with age, effective contraception is required until menopause if you don't want to become pregnant.

Why irregular cycles are the risky part

During perimenopause you get spells of ovulatory and anovulatory cycles — some months an egg is released, some months it isn't. There's no way to know from the outside which sort of month you're in.

This is also why fertility awareness methods stop working well. The FSRH notes that as menopause approaches, natural family planning becomes unreliable because of cycle irregularity and the increase in cycles without ovulation — reading cervical secretions and counting calendar days both become much harder to interpret.

The methods that depend on predicting your cycle stop being dependable exactly when your cycle stops being predictable.

HRT is not contraception

This one catches people out and it's worth being blunt about.

The FSRH is explicit: HRT is not a contraceptive method, and women on sequential HRT should be advised not to rely on it. If you're still perimenopausal, or your menopausal status is uncertain, effective contraception needs to be maintained alongside it.

The evidence behind that: in a small study of women aged 42 to 52 using sequential HRT, ovulation was inhibited in only 40% of those with regular cycles — and some women who had been anovulatory beforehand began ovulating on HRT.

Progestogen-only methods are safe to use as contraception alongside sequential HRT. That's a conversation to have when HRT is started, not eighteen months later.

Contraception can hide the transition

Something else worth knowing: the FSRH notes that contraception doesn't affect when menopause happens or how long symptoms last, but it can mask the signs of it.

If you're on combined hormonal contraception, your bleeds are the method's bleeds, not your body's. Blood tests don't rescue this either — the FSRH says hormone levels are suppressed on combined contraception or HRT and can't be used to judge menopausal status.

So it's not that you're missing information you'd otherwise have. It's that the usual signposts aren't available, which makes the age-based rules below more useful than trying to read your own signals.

When you can actually stop

This is more specific than most people realise. FSRH guidance:

If you're using non-hormonal contraception:

• Aged 40–50: stop after two years without periods
• Over 50: stop after one year without periods

If you're using combined hormonal contraception: stop at 50 and switch to a safer method — the risks outweigh the contraceptive benefits at that age.

If you're using the progestogen-only pill, implant or hormonal coil: these can continue to 50 and beyond, and can be stopped at 55, when natural loss of fertility can be assumed. If you're over 50, have no periods, and want to stop sooner, an FSH blood test can be checked — this is one of the few situations where that test is genuinely useful.

Everyone can stop at 55. Spontaneous conception after that age is exceptionally rare, even in women still having some bleeding.

Note the trap in the first rule: the two-year wait applies if you're under 50. Reaching twelve months without a period at 47 is not the finish line, even though twelve months is the definition of menopause itself.

Emergency contraception still applies

The FSRH is clear that women over 40 who still need contraception should be offered emergency contraception after unprotected sex if they don't want to become pregnant, and notes that women going through perimenopause may still ovulate despite erratic periods. There are no age-related contraindications.

The copper coil is the most effective emergency method and provides ongoing contraception. Worth knowing before you need it, because the useful window is short.

If you're hoping to conceive

This article is written for women who don't want to be pregnant, but some readers will be in the opposite position, and it would be dishonest to write only one side.

Fertility does decline steeply, and pregnancy after 40 carries higher risks than before it — the FSRH cites a UK maternal mortality rate for women over 40 that is three times that of women aged 20 to 24, along with increased rates of miscarriage, stillbirth and chromosomal conditions. That isn't a reason not to try. It's a reason to have the conversation with a GP early rather than late, because timelines matter.

What to do

If you're in your forties and using nothing because you assumed the question had resolved itself — it hasn't, and it's worth ten minutes with a GP or a sexual health clinic.

If you're on HRT and nobody mentioned contraception, ask.

If you're trying to work out whether you can stop, the rules above are age-and-method specific, and getting them confirmed for your situation is exactly what sexual health services are for. They're free, and you don't need a referral.