Can implantation bleeding happen on day of expected period

When a fertilized egg attaches to the wall of the uterus, where it can begin growing, some light spotting may occur. This is called implantation bleeding, and it can be one of the earliest clues that you are pregnant. Some women don’t experience this type of bleeding, and some simply don’t notice it. If it happens, it doesn’t indicate a problem with your pregnancy. If you’re wondering if you might be pregnant, take our Am I Pregnant? quiz for a little fun and grab a home pregnancy test.

Is It Implantation Bleeding or My Period?

It’s possible to mistake implantation bleeding for a very light and early period at first. However, there are some differences to pay attention to. Although every woman’s period is different, it’s still possible to guess that it's implantation bleeding by the color and amount of bleeding, and by where you are in your menstrual cycle, as well as by looking out for other early signs of pregnancy — more frequent bathroom trips, fatigue, and nausea (i.e., morning sickness).

These are the main signs and symptoms of implantation bleeding compared to a period:

  • The amount of blood. Implantation bleeding isn’t heavy; it’s more like a discharge or light spotting that’s about a few drops of blood on your underwear.

  • The color of the spotting. The blood from implantation is more of a pinkish or brown color, rather than a bright red some women normally see during a period.

When Does Implantation Bleeding Happen?

You may notice implantation bleeding around 10 to 14 days after conception, when a fertilized egg becomes attached to the lining of your uterus. Keep in mind that conception may not occur on the same day you had sex. Sperm can live as long as five days inside a woman’s reproductive tract, and conception might not occur for several days after sex.

Should I Take a Pregnancy Test During Implantation Bleeding?

You can take a home pregnancy test during implantation bleeding. Keep in mind that the pregnancy hormone human chorionic gonadotropin (or hCG) that pregnancy tests detect only starts being produced in your body the moment the fertilized egg is implanted in the uterus — which is the trigger for implantation bleeding. The earlier you take the test, the less hCG there is to detect, meaning that the test may not yet be accurate. If you have the patience to wait, you’ll get a more accurate test result if you wait until after the first day of your missed period.

If you get a positive test result, schedule an appointment with your healthcare provider to confirm your pregnancy. And you can get an estimate of when to expect your baby by using our handy tool to calculate your due date.

Should I See a Doctor?

Implantation bleeding is generally nothing to be concerned about, but it’s a good idea to talk to your healthcare provider about any bleeding you experience during pregnancy. Although light bleeding in early pregnancy can be totally normal, there are some reasons for bleeding in early pregnancy that need to be addressed immediately. These can include infection, miscarriage, or ectopic pregnancy.


One of the first signs of pregnancy for one-third of pregnancies is implantation bleeding. However, because it resembles light spotting or the beginning of the menstrual cycle, many pregnant women miss this early sign of pregnancy or pay it little heed.

While in some cases, bleeding during pregnancy is a red flag that something is amiss, implantation bleeding is one of the earliest signs that you’re pregnant. Since implantation bleeding can be confusing or missed, especially for women not actively trying to become pregnant, we have broken down the ins and outs of this early sign.

We will break down all you need to know about implantation bleeding, a few other early pregnancy symptoms that are likely to accompany it, and when bleeding merits a phone call to the doctor.

Put simply; implantation bleeding is when a fertilized egg attaches itself to the uterine wall. When the egg attaches and burrows in the wall, some uterine lining may shed and cause light bleeding. It is also possible that you will feel some light cramping similar to menstrual cramps.

Implantation bleeding typically happens 10-14 days after conception, around the same time your menstrual cycle would begin, which is why many women don’t notice that first missed period. However, unlike menstrual bleeding, which can last 4-7 days, when implantation bleeding happens, it lasts a day or two.

If you notice light spotting or what seems like a light period, you can use panty liners to protect your undergarments. If your normal menstrual cycle doesn’t start within a few days of noticing the spotting, it might be time to take a home pregnancy test.

Menstrual Cycle Bleeding

Can implantation bleeding happen on day of expected period

Compared to implantation bleeding, when you experience your menstrual cycle, ovulation has come and gone, and your body has not detected a pregnancy. When your brain receives the signal that its prenatal preparations are no longer needed, the thickened lining of the uterus sheds, producing your period.

Even though you are not pregnant when the first day of your cycle begins, if you become pregnant during your next ovulation cycle, your doctor will determine your due date based on the first day of your most recent menstrual cycle.

Other Early Pregnancy Symptoms

Only one-third of pregnant women will experience implantation bleeding, so it is not a guaranteed sign of pregnancy. Therefore, it is good to know some of the other signs of pregnancy.

Before you even get a positive pregnancy test, you may notice some of these additional signs whether or not implantation bleeding occurs.

  • Mood swings
  • Headaches
  • Nausea
  • Digestive issues
  • Increased urination
  • Breast tenderness
  • Lower backaches
  • Fatigue

What Implantation Should Not Look Like

Once puberty hits, vaginal bleeding is a common occurrence for teens and women; however, there are a few warning signs that the bleeding happening is not your standard menstrual period or implantation bleeding. Some unfortunate and possibly dangerous causes of bleeding are a threatened miscarriage, pregnancy loss, or an ectopic pregnancy.

Threatened Miscarriage

A threatened miscarriage is a pregnancy in danger of miscarrying during the first trimester. Signs of a threatened miscarriage include bleeding from the cervix, vagina, or uterus combined with belly pain or cramping. If your healthcare provider suspects you are at risk, they will order an ultrasound scan.

Pregnancy Loss

While many women who experience bleeding during the first trimester go on to have a healthy pregnancy, bleeding, especially if it is heavy bleeding or clots and clumps combined with stomach cramps, is a sign of miscarriage. A possible third sign of a miscarriage is smelly discharge from your vagina. If you know you are pregnant and are experiencing any of these signs, contact your ob-gyn immediately.

The American College of Obstetricians and Gynecologists (ACOG) estimates that 26% of pregnancies end in miscarriage. However, only 10% of these pregnancies are clinically recognized, which means many women miscarry before realizing they are pregnant and assume the bleeding is part of their normal period.

Ectopic Pregnancy

Can implantation bleeding happen on day of expected period

An ectopic pregnancy is a potentially life-threatening condition that occurs when the fertilized egg implants itself outside the uterine wall, usually in the fallopian tube; however, it can also occur in the ovaries, abdominal cavity, or cervix.

When an ectopic pregnancy occurs, women experience many typical symptoms of pregnancy and will also receive a positive result on a home pregnancy test.

A home pregnancy test measures the level of HCG or human chorionic gonadotropin, known as the pregnancy hormone present in a person’s urine. When fertilization and implantation occur, even outside the uterus, the body first receives many of the same signals; menstruation doesn’t occur, and HCG begins rapidly multiplying.

According to the Mayo Clinic, early signs of an ectopic pregnancy are light bleeding and cramping, possible shoulder pain, or the urge to have a bowel movement. If left untreated ectopic pregnancy can cause death to the mother.

Emergency signs include:

  • Severe abdominal or pelvic pain
  • Vaginal bleeding
  • Extreme lightheadedness or fainting
  • Shoulder pain

When Should I Take a Pregnancy Test?

If the time for your expected period has come and gone and it’s been more than three days past your usual cycle start date, it is time to take a home pregnancy test. Some over-the-counter tests are so sensitive they can detect HCG only one day past your missed period.

If you have a confirmed pregnancy test, the next step is to call your healthcare provider or ob-gyn and begin taking prenatal vitamins if you are not already doing so.

If you are experiencing several pregnancy symptoms but have taken a home test or two and they have come back negative, you should contact your doctor for a blood test. While getting a false negative is rare, it can and does happen, so if you truly believe you are pregnant, it is better to be safe than sorry and make that doctor’s appointment!

If at any time during your pregnancy you experience bleeding, you should call your doctor. While, in many cases, there is nothing to worry about, it is always wise to get checked out to ensure both you and your baby are safe.

Can implantation bleeding happen at time of expected period?

A: Unfortunately, there's no way to tell the difference between implantation bleeding and menstrual bleeding. Implantation occurs 6-12 days after conception, which is around the same time you may be expecting your monthly period, and both can produce the same amount of bleeding.

Is it possible for implantation to happen the day of expected period?

"Implantation occurs 6 to 12 days after conception or day 24 to 26 of your cycle," says Sherry Ross, an OB-GYN at Providence Saint John's Center. Since implantation happens so close to the start of your next period, any spotting you may experience is often mistaken for the beginning of your menstrual cycle.