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Implantation Calculator – When Does Implantation Occur?

Melanie was eager to get pregnant. She calculated her ovulation dates and now wanted to know if she was pregnant. Waiting for an ultrasound was too much for her as that would happen only after a few weeks. She just couldn’t wait even until she missed the period. Then what is the next best way? The implantation calculator.

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Option 1. If you know when you ovulated:

Enter your ovulation date "Date"

Option 2. If you don't know when you ovulated:

Enter first day of your last menstrual period

Your average cycle length

implantation calculator for pregnancy

When trying to get pregnant, you look for any signs that help you conclude that you are pregnant. And one of the surest signs is to watch out for implantation. But knowing it isn't half as easy as saying it is. Therefore, MomJunction has created an implantation date calculator to make it easy for you!

Our calculator calculates the expected date of implantation based on your ovulation date, or the first day of your last menstrual period and Average Cycle Length. For women with fertility issues, the calculation is done on the basis of Embryo Transfer Date. Our implantation bleeding calculator also estimates the date on which you can take a pregnancy test. All you need to do is enter your method of conception and the dates that you remember best.

Most Frequently Asked Questions About Implantation

Q. What is implantation?

Implantation is the beginning of pregnancy stage when the fertilized egg attaches itself to the uterus wall.

Q. When does implantation occur after ovulation?

After fertilization, the egg undergoes repeated cell division, which forms the blastocyst. This blastocyst attaches to the uterus wall during implantation, marking the beginning of pregnancy. For women with a 28-day menstrual cycle, the ovulation takes place on the 14th day of the cycle. The fertilized egg remains in the Fallopian tube for three days before reaching the uterus. Hence, the implantation of the ovum is likely to occur 9 days past ovulation, but in some cases, it can range anywhere between six and 12 days. However, the implantation can take place earlier or later than this.

Q. What are the signs and symptoms of implantation?

In most of the cases, the process of implantation is very gentle. But some women can experience strong signs and symptoms which include:

1. Frequent urge to urinate:

During pregnancy, the hormones are regularly released into the body from the corpus luteum that is located in each ovary. The primary hormone released in the body is progesterone, a steroid hormone required for establishing and maintaining pregnancy. The other hormone is hCG or Human Chorionic Gonadotropin. This hormone comes out from the blastocyst, which turns into an embryo while working its way into the uterine wall. This hormone increases the blood supply to the pelvic region, thereby irritating the bladder and leading to frequent urination.

2. High basal body temperature:

High basal body temperature occurs during a period of prolonged rest, especially during sleep. The best time for you to check the basal temperature is in the morning, just after waking up. If the temperature increases by around one and a half degrees, it could be due to implantation. The rise in temperature occurs between the 7th and 10th day after ovulation. You may also experience a fall in the temperature, called the implantation dip, a week after ovulation.

3. Spotting:

Spotting is the most common sign of implantation. Remember, spotting or bleeding always coincides with the rise in basal body temperature.

4. Swelling, soreness and tenderness of breasts:

The rapid changes in the hormones during implantation make the breasts swollen or sore. These symptoms often occur during menstruation, but recede after a few days. But during implantation, the discomfort can last over a week.

5. Hot flashes:

Hot flashes are not the best indicator as they often occur before or during the menstrual cycle. But at the time of implantation, rapid fluctuation in hormone levels takes place. Therefore, you can experience a hot flash while the embryo is trying to embed itself in the uterine wall. It also releases a significant amount of hCG hormone in the process.

Very few people feel these symptoms during implantation. So do not fret if you don’t experience one or any of these signs or symptoms. Just go ahead and get yourself a pregnancy test done to determine whether you are pregnant or not.

Q. When does implantation bleeding occur?

It occurs around seven to 14 days past ovulation (dpo), when the fertilized egg is implanted in the lining or uterus wall. While it’s happening, a small part of uterine lining can be released or disturbed, resulting in breeding.

Q. What does implantation cramping feel like?

Cramping is also a sign of implantation. Most women tend to confuse implantation cramping with menstrual cramping. But the major difference is that former is milder and lasts longer. The cramping is usually felt in the lower back because of the regular series of contractions that the walls of the womb undergo.

Q. How long does implantation cramping last?

Implantation cramping can last over one or two days.

Q. How common is implantation cramping?

Implantation cramping is quite common at that stage, but varies from one woman to another. There are also chances of it not occurring at all during the process.

Q. Which color is implantation bleeding?

Spotting or bleeding due to implantation is usually pink or brown in color instead of dark red. It’s usually brown in color because, during implantation, the blood takes time to travel from the uterine wall to the vagina, and thus it changes color from red as it is no longer fresh. Implantation bleeding is lesser. At times, the bleeding could be just a single spot, or could go on for several hours or days.

Q. How do you know if it is your period or implantation bleeding?

1. Unlike the bleeding during your menstrual cycle, implantation bleeding is not continuous. It is often spotting or bleeding with intervals.

2. Period bleeding lasts from three to seven days while implantation bleeding can be for one or two days.

3. Whereas cramps are severe during period they are usually mild during implantation.

Q. When can you take a pregnancy test?

The level of hCG hormone has to be more than 25 mlU/ml for the pregnancy to be detected. If the level is lower than this, the pregnancy cannot be detected, even after implantation. Therefore, you must wait at least a week or two after missing the period to take the pregnancy test.

If you experience these signs and have a delayed period, it’s likely that you are pregnant. To get the exact results, take a home pregnancy test. It will give you accurate results. If you get negative results, wait for at least three days before you do the test again.

You can even get a blood test done to see if you are pregnant. Blood tests are more accurate than home pregnancy tests. These tests will give you accurate results as early as 6 days after ovulation.



Remember, the implantation calculator is one of the many ways to determine pregnancy, not the only one. If you have any concerns regarding pregnancy or implantation or if any of these symptoms persist, contact a gynecologist.

Do you have any questions regarding the implantation calculator or any other related topics? Tell us in the comment section below!