Withdrawal Bleed vs Period: What's the Difference?

7 min read

Withdrawal bleed vs period: what's the difference?

A withdrawal bleed is the bleeding you get during the break or placebo days of combined hormonal contraception. It is caused by the drop in hormones when you stop taking them for a few days, not by ovulation, so it is not a true period. SH:24 says it plainly: “The bleeding you have when you take a break from the pill is not a period.” Brook says it “isn’t a proper period”. It can look and feel like one, which is why the two get mixed up.

Withdrawal bleed vs period at a glance

  Withdrawal bleed Period in a natural cycle
What causes it Hormone levels fall during the break or placebo days (SH:24, Cleveland Clinic) Oestrogen and progesterone fall when pregnancy does not happen, and the womb lining comes away (NHS)
Ovulation before it Usually none. Combined methods almost always stop ovulation (SH:24) Yes. An egg is released around 10 to 16 days before the period starts (NHS)
When it comes Set by your pack, patch or ring schedule (Cleveland Clinic) Set by when you ovulate
Flow Often lighter and less painful (SH:24, Cleveland Clinic). It can be very light or not come at all Your own usual flow
Length Cleveland Clinic says about four to seven days; SH:24 says usually shorter than a normal period Around 2 to 7 days (NHS)
What it means for tracking It reflects your method’s schedule, not your own cycle Day one starts a new cycle

Is a withdrawal bleed a real period?

Not in the biological sense. In a natural cycle, your own hormones build up the womb lining, an egg is released, and if there is no pregnancy, hormone levels fall and the lining is shed as a period (NHS). On the combined pill, patch or ring, the steady hormones stop the ovaries releasing an egg (NHS, SH:24). Cleveland Clinic explains that withdrawal bleeding happens instead because hormone levels change when you take a break, which triggers bleeding.

Cleveland Clinic notes the break was built in to mimic a natural cycle, and there is no medical reason you need a withdrawal bleed. Taking active hormones back to back without a break often means no withdrawal bleed at all (Brook, SH:24); a doctor, nurse or pharmacist can say whether that suits your method.

Why a withdrawal bleed is often lighter and shorter

The main reason is the womb lining. SH:24 explains that while you take the combined pill, the lining stays thin, so there is less to shed. Cleveland Clinic says the same: on hormonal birth control the lining does not thicken as it does in a natural cycle, so the flow is not as heavy.

Symptoms can be milder too. Cleveland Clinic says the hormone shift is less severe, so premenstrual symptoms may ease, though cramps and headaches can still happen. Brook adds that the bleed can start at any point during the break.

Which methods cause a withdrawal bleed

Withdrawal bleeds come from combined methods, which contain both oestrogen and progestogen:

  • Combined pill, 21-day packs. You take a pill for 21 days, then have a 7-day break, and you will usually bleed during the break (NHS).
  • Combined pill, everyday (ED) packs. These include dummy pills with no hormones. Some packs have 7, others 2 or 4, and you usually bleed while taking them (NHS).
  • Contraceptive patch. After three weekly patches comes a week with no patch, and you may have a bleed during it (NHS). See birth control patch vs pill for how the two compare.
  • Vaginal ring. The ring stays in for 21 days, then there is a 7-day gap, and you may have period-like bleeding during that time (NHS). Vaginal ring schedule tracking covers the rhythm.
  • Extended pills. Cleveland Clinic says 91-day packs can give a withdrawal bleed every three months.

Some methods do not cause withdrawal bleeds. Cleveland Clinic says the implant, injection and hormonal IUD do not, and that bleeding when you start them is breakthrough bleeding instead. SH:24 says progestogen-only methods affect bleeding unpredictably.

Cleveland Clinic adds that a withdrawal bleed can also follow switching methods or brands, or missed doses. What to do after a missed dose is a separate question, covered in missed pill: what to do and when the birth control patch falls off. When you stop the pill for good, the first bleed may still be a withdrawal bleed; when will my period come back after stopping the pill explains what comes next.

What if there is no withdrawal bleed?

The sources describe the bleed as something that “may” happen. Brook says you may get a bleed in the pill-free week, and the NHS patch and ring pages say the same. Planned Parenthood lists periods stopping altogether among the changes the pill can cause.

If no bleed comes, sources point to three places:

  • The leaflet in your pack. The NHS says to follow the leaflet that comes with your pills, and to check the patch or ring leaflet, or ask a pharmacist, if a patch came loose or a ring was not changed on time.
  • A pregnancy test, if you are worried. Planned Parenthood says you can always take a test to be sure. SH:24 suggests a test if you have pregnancy symptoms or missed a pill, and says your pill will not affect the result. The NHS says the same about contraceptive hormones.
  • A GP or clinic. The NHS says to speak to a GP if you get a negative result after a second test but your period has not arrived.

Cleveland Clinic also advises contacting a healthcare provider if bleeding lasts longer than a week or happens when it should not, such as in the middle of a pill pack. The NHS says bleeding between periods is common in the first few months of the pill, and to speak to a pharmacist or doctor if side effects are still a problem after 3 months.

How to track a withdrawal bleed

Log it as a bleed. It is still bleeding, and a record helps if anything changes. But its timing comes from your method’s schedule, not your own cycle, so cycle lengths counted from withdrawal bleeds follow your pack, patch or ring rhythm rather than ovulation. A few habits help:

  1. Log the first day of each withdrawal bleed and how long it lasts.
  2. Log bleeding outside the break separately, so you can see whether breakthrough bleeding settles.
  3. Note the day you change method or brand, since Cleveland Clinic says that can trigger a bleed.
  4. If you stop hormonal contraception, start counting natural cycles from the first real period after that.

Log your method and your bleeds in one place

Lua: Period & Birth Control has method reminders for the pill, patch, ring, shot and IUD or implant, lets you log each pill, patch or ring day, and logs your bleeding days too. Lua’s period estimate is worked out from the bleeds you log and does not factor in your method, so while you use the pill, patch or ring, your pack schedule is the better guide to your next bleed. Everything stays on your iPhone with no account.

Sources

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