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Implantation Calculator

This calculator shows possible implantation dates based on when you ovulated (either actual, or calculated based on last period): that is, approximately when your egg, if successfully fertilized, would attach to the endometrium, after which the pregnancy hormone is produced and starts to double quickly.

When did you ovulate?

Not sure. Calculate (use my last period, cycle and luteal length)
I ovulated On

Note: To facilitate using WhenMyBaby calculators, use Stickies to set your key cycle dates. Using MyMonthlyCycles free fertility tracker? Easily transport your cycle data to WhenMyBaby's stickies!

From Fertilization to Implantation

During the first phase of the menstrual cycle, the Follicular Phase, follicles start to develop in one of the ovaries, stiumulated by the hormone FSH, courtesy of the pituitary gland. At some point, one follicle becomes dominant, probably having had enough of life behind ovary walls, and, with help from a surge of LH, breaks out of the ovary (ie. ovulation).

Now alone out in the fallopian tube, she waits. And waits... With good-timing, and a little/lotta baby dust, if just one of hundreds of millions of sperm manages to find its way and fertilizes the egg, a zygote comes to fruition.

Over the next 5 to 6 days, the newlyweds have two primary tasks: move from the oviduct into the uterus; And, during this journey, transform from the 1-celled fused zygote to a multi-celled blatocyst which can implant into the uterine wall. All this, and more, as we go through our day, wondering if it's time to stock up on pregnancy tests...!

From Implantation to Pregnancy Testing

Calculate and

Related Pregnancy Calculators and More

  • Implantation Doubling Calculator

    - Simulates pregnancy hormone doubling based on the most likely implantation dates in your cycle, and, using 2 and 3 day doubling, shows what levels would be on/before/after the day of your next period.

  • Pregnancy Test Calculator

    - Calculate when to take a pregnancy test based on your menstrual cycle info. Also helpful if you want to early pregnancy test.

  • Home Pregnancy Tests

    - How HPTs work, taking the test, false negatives and positives, accuracy rate and more.

  • Free Fertility Charting at MyMonthlyCycles.com

    - Track and chart your fertility cycles for free, including BBT charting. Includes supportive TTC charting community, dozens of conceiving calculators, period tracker, pregnancy tracker - online and mobile.