Implantation bleeding vs your period: how to tell the difference
A little spotting when your period is due can send your mind racing. Is it the start of your period, or could it be an early sign of pregnancy? Here is how the two usually differ, and when any bleeding is worth a phone call.
What implantation bleeding is
When a fertilised egg settles into the lining of the womb, around 10 to 14 days after conception, some people notice a small amount of light spotting. That is what is meant by implantation bleeding. It tends to happen around the time your period would have been due, which is exactly why it causes confusion.
It is worth saying clearly: not everyone gets it. Plenty of people have a perfectly healthy pregnancy with no early spotting at all, so its absence means nothing either way.
How it usually differs from a period
- Colour. Implantation spotting is often pink or brownish, rather than the brighter or darker red of a typical period.
- Flow. It is usually very light, more of a spot or a smear than a flow, and it does not get heavier the way a period builds up.
- Length. It tends to last a few hours up to a couple of days, rather than the three to seven days of a period.
- Clots. It does not usually contain clots, whereas a period often does.
- Cramping. Any cramps are usually milder than period pain.
These are general patterns, not a reliable test. Bodies do not read the rulebook, and a light, short period can look a lot like implantation spotting and vice versa.
So how do I actually know?
The honest answer is the same as ever: a pregnancy test, not the bleeding itself. If your spotting was implantation bleeding, there should be enough of the pregnancy hormone hCG to detect with a home test within a few days. Wait until the first day of your missed period for the most reliable result. Our guide to the early signs of pregnancy covers when and how to test.
When to call your GP or midwife
Light spotting is common and often harmless, but some bleeding needs prompt advice. Contact your GP, midwife or NHS 111 if you have:
- Bleeding that is heavy, like a period or more, or that soaks through pads.
- Bleeding with significant pain, especially one-sided tummy pain or shoulder-tip pain.
- Any bleeding once you already know you are pregnant, so it can be checked.
- Feeling faint, dizzy or unwell alongside the bleeding.
These can have simple explanations, but they are always worth getting looked at rather than worrying alone.
Frequently asked questions
How long does implantation bleeding last?
Usually from a few hours to a couple of days, and it stays light rather than building up like a period.
Does everyone get implantation bleeding?
No. Many people never have it, and that is completely normal. It is not something to look for as a sign of a healthy pregnancy.
Can I take a test during the spotting?
You can, but a result is more reliable from the first day of your missed period, a few days later. If it is negative and your period still does not come, test again.
The bottom line
Implantation bleeding is light, brief and often pink or brown, while a period is heavier, redder and builds up over days. But the only way to know what is going on is a pregnancy test from the first day of your missed period. Any heavy bleeding, or bleeding with pain, deserves a call to your GP.
Sources
Read next: Early signs of pregnancy · How to get pregnant.
This article is general information, not medical advice. For advice about bleeding or your own pregnancy, contact your GP, midwife or NHS 111, or see nhs.uk/pregnancy.