Implantation is a critical step in the process of conception that isn’t always spoken of or understood. While it’s absolutely vital to get right, many hopeful parents aren’t educated on the subject and so they’re missing out on the key to getting pregnant.

While the intricate details of implantation aren’t fully known, we have developed a calculator to help pinpoint the most likely days to achieve implantation during your menstrual cycle – click here to go straight to the calculator.


Implantation Defined

Implantation is when a sperm comes into contact with an egg, the two join together to become an embryo. The embryo then travels to the uterus where it attaches itself into the lining.

Without this step, conception is not possible, as the embryo will flush itself out during the next cycle.

After implantation occurs, it’s normal to see some light bleeding or spotting. This is actually from the embryo attaching to the uterine wall and is nothing to be concerned with. It’s actually a good sign!

Timing of Implantation

The timing of implantation is important because it can only happen during a short window when an egg is present. If sperm is in the cervix too early or too late, it won’t be there at the same time as the egg and so they’ll never meet to form an embryo.

A woman releases eggs during the ovulation period of her cycle. This period is typically 12 to 14 days after the start of a new cycle or after the first day of a period.

Once an egg and sperm join, it takes around 8 to 10 days to make the journey to the uterus where it will implant. While it can happen before or after this period, it’s most likely to occur on days 8 to 10 of post-ovulation.

The first sign that implantation has occurred is when the body starts to produce the pregnancy hormone, chorionic gonadotropin.

Among the pregnancies that lasted six weeks or more, the first appearance of chorionic gonadotropin occurred 6 to 12 days after ovulation; 118 women (84 percent) had implantation on day 8, 9, or 10.

Implantation Calculator


When did your last period start?


How long is your cycle?



Calculating the days of your cycle, ovulation, and the most likely days for the embryo to implant can be confusing, so it’s best to use an ovulation or implantation calculator to get the best estimate for when to try to conceive.

It can also put your mind at ease to calculate your implantation dates so if you see light bleeding, you’ll know if it’s possible to be related to the embryo implanting rather than your next period or a miscarriage.

How To Use The Implantation Calculator

The calculator is simple to use and all you’ll need to know is the day you started your last period and the typical length of your cycle.

Once you plug in those numbers, the calculator will give you several dates that are important for you to know when trying to conceive:

Estimated Fertile Period – This is the range of dates that you’re most likely to be fertile or in other words when an egg is most likely to be released from the Fallopian tubes.

Implantation – This is the range of dates that, if an embryo was formed, it would likely make it to the uterus to implant itself in the wall.

Most Likely Date Range – Most implantation occurs on days 8 to 10, so this is the range of the most likely days for implantation according to when 84% of women experience it.

Once the calculator is finished, you’ll have your date ranges as well as a chart that shows you the days past ovulation with the highest probability of implantation.

This is helpful to look at so you can pinpoint the possible cause of any cramping or bleeding you may experience that could be related to implantation of an embryo.

To Conclude

It’s important to note that the calculator only provides an estimation of your ovulation and implantation dates according to the information provided.

If you’ve been trying to conceive for longer than six months with no success, it may be a good idea to talk to a doctor and work together to form a plan for conception.

Many fertility issues can be resolved with proper nutrition and vitamins, so try not to worry too much before speaking to a specialist.

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