Can implantation happen the day of your period

Understanding and identifying the signs & symptoms of implantation bleeding

You’re trying for a baby. You’ve done the important ‘making’ part and now it’s a waiting game. A waiting game that probably means you’re keenly looking out for any early signs of pregnancy. Then you spot signs your period might be on its way. Before reaching for a consolation chocolate bar and ordering a new box of ovulation sticks, consider whether it could be implantation bleeding instead.

Table of Contents Show

Understanding and identifying the signs & symptoms of implantation bleeding
What is implantation bleeding?
What are the signs and symptoms of implantation bleeding?
What is the difference between implantation bleeding and a period?
Are there any times when I should be worried by implantation bleeding?
Implantation bleeding
Implantation bleeding symptoms
When does implantation bleeding occur?
How long does implantation bleeding last?
How common is implantation bleeding?
How can I tell if it's implantation bleeding or my period?
When to see a doctor for bleeding in early pregnancy
Can implantation bleeding occur on the day of your expected period?
Could implantation happen during your period?

What is implantation bleeding?

Implantation bleeding is an early sign of pregnancy and happens when a fertilised egg attaches itself to the lining of the uterus in order to begin growing. It is completely normal and does not need any medical treatment. It’s thought about one third of women experience implantation bleeding. The difficulty is that it happens at a similar time in your cycle to menstruation, so it’s often confused with having an early period.

What are the signs and symptoms of implantation bleeding?

A pink or brownish discharge or spotting
Light or faint stomach cramping
Mood Swings
Headaches

The tricky thing is that most of these symptoms can also be early signs of pregnancy. It’s possible that you’ve been checking your boobs for tenderness and scrutinising your undies since about day 18 of your cycle, so how do you know if this is implantation bleeding or the start of your period?

What is the difference between implantation bleeding and a period?

There are several key differences between implantation bleeding and menstruation which can help you work out whether you’ve conceived or not.

Colour: for implantation bleeding the discharge or spotting will usually be pinkish or dark brown, whereas period blood tends to be bright, vibrant red.
Duration: as implantation bleeding only happens while the egg is fixing itself to the uterus, it may last as little as a few hours or up to 1-2 days. It will remain light and possibly stop and start during this time. There are normally no clots. If bleeding starts off light, but gets heavier, has a constant flow and lasts 4-7 days it is almost certainly your period.
Timing: implantation bleeding usually happens about 10 days after ovulation, while menstruation normally occurs after 14. So pinkish spotting on day 22-25 is more likely to be implantation bleeding than first signs of menstruation (usually around day 26-27).
Cramping: it is possible to experience light cramping when the egg is attaching itself to the womb, but it would be very faint and not increase in strength. That’s compared to cramps caused by menstruation which are usually more intense and get stronger.

Are there any times when I should be worried by implantation bleeding?

This very early sign of pregnancy is not usually a reason to be concerned; it is perfectly normal and no risk to the developing baby. However, if you are also experiencing symptoms such as, lower abdominal pain, nausea, dizziness or vomiting you should see your doctor as is may be an indication of an ectopic pregnancy.

Still not sure?

As with a lot of early signs of pregnancy, the only real proof that you’re on the path to parenthood is that all-important line on the pregnancy test. If you think you’ve experienced implantation bleeding, the advice is that you need to wait at least 3 days before taking a home pregnancy test. Before that, there’s unlikely to be enough of the pregnancy hormone hCG to give a positive result. If you can bear to wait 5 days, there’s even more chance it will be accurate. In the meantime keep looking out for other early signs.

“I’d never heard of implantation bleeding. I just assumed I had had a slightly lighter period than normal and got back to the job of trying to make a baby. I couldn’t believe it when I got a ‘3weeks+’ reading on a pregnancy test a fortnight later!”

Implantation bleeding is light bleeding that may happen about six to 12 days after conception. It may be caused by a fertilized egg implanting in the blood-rich lining of your uterus. Implantation bleeding can be an early sign of pregnancy, but some women mistake it for menstrual blood because it may happen around the time they expect their period.

Implantation bleeding

Implantation bleeding is light bleeding that a small percentage of pregnant women have at about six to 12 days after fertilization. Here's the theory behind why it happens:

After the sperm fertilizes the egg, it starts the three- or four-day trip from the fallopian tube to your uterus. During this time, it divides into hundreds of identical cells. Meanwhile, your ovaries release estrogen that causes the lining of the uterus (the endometrium) to thicken and develop more blood vessels. The uterine lining is preparing to host the quickly growing egg that will soon become an embryo.

Once the egg enters the uterus, it's called a blastocyst, a tiny ball of several hundred cells. A day or two later, it begins burrowing into the blood-rich lining of your uterus, where it continues to grow and divide. As it burrows into the endometrium, the blastocyst may cause little blood vessels to burst, resulting in a small amount of vaginal bleeding.

Implantation bleeding symptoms

In addition to light bleeding, some women also have these other implantation symptoms:

Light cramping (less than with a normal period)
Nausea
Breast tenderness
Lower back pain
Mood swings
Headaches

Note that these symptoms are no guarantee that you're pregnant – they can also be signs of ovulation or PMS. Taking a home pregnancy test is the best way to find out if you're pregnant. (Though you may have to wait a few more days to get an accurate result.)

If you do get your period instead of a positive pregnancy test, and haven't yet scheduled a preconception visit with a midwife or doctor, now is a good time to do so.

When does implantation bleeding occur?

Implantation bleeding tends to occur during the week before you would expect your period, or about six to 12 days after conception. This is around the same time a fertilized egg would be attaching itself to the uterine lining.

How long does implantation bleeding last?

Unlike a regular menstrual period, implantation bleeding usually lasts no more than a day or two. This is the amount of time it takes for the fertilized egg to become implanted into the lining of the uterus.

How common is implantation bleeding?

By some estimates, about 15 to 25 percent of women experience implantation bleeding. Some women may think they’re having a light period when they see the spotting. They may not realize they're pregnant.

How can I tell if it's implantation bleeding or my period?

Here's how to tell whether your bleeding is more likely to be implantation bleeding or your period:

Amount of blood. Implantation bleeding is a lot lighter than a typical period. It's usually just a little spotting.
Length of time. Most women bleed for three to seven days during their period. Implantation bleeding often lasts only one to three days.
Color. Menstrual blood is usually bright red or dark red, but implantation bleeding tends to be a light pink, brown, or rust discharge.
Clotting. Many women bleed enough during their period that some of the blood clots or becomes like a gel. Implantation bleeding is too light to clot.

When to see a doctor for bleeding in early pregnancy

If you continue spotting even after a positive pregnancy test, or if you develop other symptoms (such as pelvic or abdominal pain, dizziness, or lightheadedness), call your provider immediately.

You may need an exam to make sure you don't have an ectopic pregnancy. This happens when the fertilized egg grows outside the uterus, usually in a fallopian tube. (It's possible to have an ectopic pregnancy even if you don't get a positive result on a pregnancy test.)

Bleeding or cramping in early pregnancy may also be a sign of an impending miscarriage. But many women spot in the first trimester for no apparent reason and go on to have a completely normal pregnancy.

Learn more:

Quiz: Am I pregnant?

Video: What is implantation bleeding?

Can implantation bleeding occur on the day of your expected period?

Implantation bleeding is thought to happen when the fertilized egg attaches to the lining of the uterus. Implantation bleeding usually occurs around the time you would expect to have a menstrual period. However, implantation bleeding is lighter than menstrual bleeding.

Could implantation happen during your period?

The fertilized egg then implants into the uterine wall around days 22 to 26 of your cycle. If your body follows a 28-day menstrual cycle, you won't get your period until after day 28. So, if you're bleeding earlier and lighter than normal, there's a good chance it's implantation bleeding, not your period.