The short answer: No, you can't have a true period while pregnant. Once you conceive, pregnancy hormones keep the womb lining in place, so it isn't shed each month. But some women do bleed in pregnancy, especially in the first few weeks, and it can look like a light period. This bleeding has other causes, from harmless implantation spotting to miscarriage or ectopic pregnancy, so any bleeding in pregnancy should be checked by your doctor the same day.
Why periods stop when you're pregnant
A period is your womb shedding its lining. Each month, the lining thickens in case an egg is fertilised. If no pregnancy happens, hormone levels fall, the lining breaks down and comes out as period blood.
When you do conceive, the fertilised egg sends signals that keep hormone levels high, especially progesterone. That keeps the lining thick and in place, because it is now supporting the pregnancy. With no shedding, there is no period. That is why a missed period is so often the first sign of pregnancy.
So any bleeding during pregnancy, even if it arrives on the date your period was due, is not a period. It's bleeding from another cause, and that cause is worth knowing.
What bleeding in early pregnancy can be
Bleeding in pregnancy is fairly common, and many women who bleed go on to have healthy babies. These are the main causes in the first 12 weeks or so.
Implantation bleeding
About a week or so after conception, the fertilised egg burrows into the womb lining. This can cause light spotting, often pink or brown, around the time your period would have been due. It's usually much lighter and shorter than a period, and it's harmless. It's the most common reason women think they had a "light period" in early pregnancy.
Changes in the cervix
The cervix is the neck of the womb, at the top of the vagina. In pregnancy it has a much bigger blood supply, so it can bleed lightly after sex or after an internal examination. This is usually harmless, but your doctor will still want to check.
Infection
A vaginal infection, a urine infection or a sexually transmitted infection can cause spotting. You may also notice itching, a change in discharge or burning when you pee. These need treatment, so tell your doctor.
Miscarriage
Bleeding, often with cramping pain in the lower tummy, can be a sign of miscarriage. Bleeding doesn't always mean miscarriage, and many women with spotting continue their pregnancy normally. But it needs checking.
Ectopic pregnancy
An ectopic pregnancy grows outside the womb, usually in a fallopian tube. NHS figures put it at about 1 in 90 pregnancies. Symptoms usually appear between 4 and 12 weeks and can include pain low on one side of the tummy, bleeding or a brown watery discharge, pain at the tip of the shoulder, and discomfort when peeing or pooing. This is a medical emergency.
Molar pregnancy
This is a rare problem where the pregnancy doesn't develop properly. It can cause bleeding and is found on an ultrasound scan.
Sometimes no cause is found at all, and the pregnancy continues normally.
Bleeding later in pregnancy
Bleeding after the first trimester is less common and should always be checked straight away. Causes include:
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Placenta problems: such as a low-lying placenta (placenta praevia), where the placenta covers part or all of the cervix, or the placenta starting to come away from the wall of the womb.
- Cervical changes or infection.
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A "show": near the end of pregnancy, the plug of mucus that seals the cervix can come away. It is sticky, jelly-like and often pink with a little blood. It can mean labour is close, though labour may still take a few days. If you are losing more blood than a streak, phone your hospital straight away.
Our full guide to bleeding in pregnancy explains each stage in more detail, including what the doctor will check.
Period or pregnancy bleeding? How to tell
If you aren't sure whether you're pregnant, comparing what you're seeing with your usual period can help. Treat this as a clue, not a diagnosis. Only a test can tell you for sure.
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If your "period" is much lighter or shorter than usual, or a different colour, and there's any chance you could be pregnant, take a home test. Our guide to why your period might suddenly be lighter covers the other common reasons too.
Can you be pregnant and still bleed every month?
Rarely, yes. A small number of women have light, regular bleeding in early pregnancy and assume it's their period. They may not realise they're pregnant for weeks, sometimes longer.
This is more likely if your periods were already irregular, for example with PCOS, if you've recently had a baby and your cycle hadn't settled, or if you're using hormonal contraception that already makes bleeds light or unpredictable.
The bleeding still isn't a true period. It's spotting from one of the causes above. If you have pregnancy symptoms alongside unusual bleeding, testing is the simplest way to know.
Pregnancy tests: when to take one and what the result means
Home pregnancy tests from a chemist are cheap, quick and accurate if you follow the instructions. Here is what NHS guidance says:
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When to test: most tests work from the first day of a missed period. If you don't know when your period is due, test at least 21 days after you last had unprotected sex.
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Time of day: you can use urine from any time of day.
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Positive result: almost certainly correct.
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Negative result: less reliable, especially if you tested too early. Wait a few days and test again. If it's still negative and your period hasn't come, see your doctor.
Bleeding after a positive test
Bleeding after a positive test isn't a period. It may well be harmless, but it needs checking. Contact your doctor or maternity hospital the same day. If you're in early pregnancy, they may suggest a scan and blood tests.
A negative test and an odd bleed
If the test is negative and you've had a light or strange bleed, it may simply be a lighter period, stress, a change in weight or your cycle shifting. Our guide to late periods when you're not pregnant explains common reasons. Repeat the test after a few days if you're unsure.
What to do if you bleed in pregnancy
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Call your doctor or maternity hospital the same day, even if the bleeding is light and you feel fine.
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Use a pad, not a tampon or menstrual cup, so you and your doctor can see how much blood there is and what colour it is.
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Note the details: when it started, the colour, roughly how many pads you've used, and whether you have pain.
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Take your pregnancy records or scan reports with you if you go to hospital.
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Rest until you've been seen, and ask someone to take you rather than travelling alone.
The doctor will usually ask how many weeks pregnant you are, about your symptoms and any earlier pregnancies. They may examine you, and may do an ultrasound scan, blood tests or a urine test. Treatment depends on the cause. Sometimes none is needed, and sometimes you'll be monitored more closely.
Staying comfortable and keeping track
Many women notice more vaginal discharge in pregnancy, which is normal if it's thin, clear or white and doesn't smell unpleasant. A breathable panty liner can help you feel fresh, and it also makes it easier to spot any change in colour early. Change it regularly, and don't use scented products.
If you do have spotting, a cotton pad lets you see the amount and colour clearly, which is exactly the information your doctor will ask for. For washing, plain water on the outside is enough, or a mild intimate wash used only on the outside. Never douche or wash inside the vagina.
If you notice discharge that's green, grey, yellow or smells strong, or itching and soreness, read our guide to vaginal infections and tell your doctor, as some infections need treatment in pregnancy.
When to get help
See your doctor the same day if
- You have any spotting or bleeding in pregnancy, even with no pain.
- You have bleeding with mild tummy pain or cramps.
- You have bleeding with pain or pressure when you pee or poo, or with diarrhoea.
- You've had a positive test and then a bleed.
Get urgent help if
Call 112 or 108, or go to the nearest hospital emergency department straight away, if you're bleeding and have:
- Severe tummy pain that stops you focusing or doing anything else, or sharp pain on one side.
- Pain in the tip of your shoulder.
- Dizziness, fainting, feeling sick or looking very pale.
- Heavy bleeding that soaks a pad soon after you put it on, or passing clots or tissue.
Don't drive yourself. Ask someone to take you or call an ambulance.
Frequently asked questions
Can I have a period in the first month of pregnancy? Not a true period. You may have light implantation bleeding around the time your period was due, which some women mistake for a light period.
Can I get a positive test and then a period? Bleeding after a positive test isn't a period. It needs checking, so contact your doctor the same day.
Is brown spotting in early pregnancy normal? Light brown spotting can be harmless, as brown blood is usually older blood. It should still be checked, especially in the first 12 weeks. Our guide to brown discharge explains more.
How long does implantation bleeding last? Usually from a few hours to a couple of days. It's light, pink or brown, and doesn't build into a heavier flow like a period.
Can you have a period and still be pregnant with a negative test? It's unlikely but possible if you tested too early. If your bleed was unusual and you have pregnancy symptoms, test again a few days later, or see your doctor.
Is bleeding after sex in pregnancy dangerous? The cervix can bleed lightly after sex because of its extra blood supply, and this is often harmless. Tell your doctor so other causes can be ruled out.
Does bleeding in pregnancy always mean miscarriage? No. Many women bleed in pregnancy and go on to have a healthy baby. Getting checked quickly is what matters.
Related reading
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Vaginal bleeding in pregnancy, NHS: Periods, NHS: Doing a pregnancy test, NHS: Ectopic pregnancy, NHS: Signs that labour has begun
