Implantation Calculator

Estimates the time after ovulation when the fertilized egg adheres to the uterine wall and when pregnancy test positivises.

Refer to the text below the tool for more information about estimating implantation for natural and IVF pregnancy.


Implantation occurs around nine days post ovulation and marks the moments at which the fertilized egg adheres to the uterine wall. Whilst the average is nine days, implantation time may range between six and twelve days.

Implantation triggers the uterus to start producing human chorionic gonadotropin (hCG) which means it also marks the time after which a positive pregnancy test may be obtained (either as blood or urine test), usually after 3-4 days.


  • For a natural pregnancy: implantation occurs nine days post ovulation on average;
  • For an IVF pregnancy: implantation occurs four days post IVF transfer day.

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Steps on how to print your input & results:

1. Fill in the calculator/tool with your values and/or your answer choices and press Calculate.

2. Then you can click on the Print button to open a PDF in a separate window with the inputs and results. You can further save the PDF or print it.

Please note that once you have closed the PDF you need to click on the Calculate button before you try opening it again, otherwise the input and/or results may not appear in the pdf.


 

Estimating Implantation Date

Implantation occurs around nine days post ovulation and marks the moments at which the fertilized egg adheres to the uterine wall. Whilst the average is nine days, implantation time may range between six and twelve days.

Implantation of the blastocyst triggers the uterus to start producing human chorionic gonadotropin (hCG) which means it also marks the time after which a positive pregnancy test may be obtained (either as blood or urine test), usually after 3-4 days.

  • For a natural pregnancy: implantation occurs nine days post ovulation on average;
  • For an IVF pregnancy: implantation occurs four days post IVF transfer day.

It is important that the above figures are average and that every pregnancy is unique and the dates may vary. Similarly, in some pregnancies, implantation is followed by light spotting, known as implantation bleeding, because the uterine lining may be disturbed.

The difference between implantation bleeding and period blood is that the latter tends to be bright and vibrant red in color whilst the spotting is usually pink or dark brown.

Implantation may also be accompanied by light and low strength abdominal cramps, that are significantly less intense than period cramps.

 

References

Gupta SK. Embryo Implantation and Pregnancy: Immunologic Intricacies and Strategies for its Success. Am J Reprod Immunol. 2016; 75(3):205-207.

Sandra O. Hormonal control of implantation. Ann Endocrinol (Paris). 2016; 77(2):63-66.


Specialty: Obstetrics Gynecology

Article By: Denise Nedea

Published On: September 6, 2020

Last Checked: September 6, 2020

Next Review: September 6, 2025