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<html><head></head><body><h2>What is implantation and when does it happen?</h2>
Implantation is usually considered the beginning of pregnancy. Fertilization takes place before implantation and occurs&nbsp;when the sperm joins with the egg. Implantation occurs when the fertilized egg (called the blastocyst or embryo) attaches itself to the wall of the uterus.

<a href="https://babymed.com/node/5399">On average, implantation takes place 9 days after ovulation/fertilization</a>&nbsp;or 9dpo. It&nbsp;normally takes&nbsp;between 6-12 days&nbsp;for the developing embryo to reach the uterus and attach to the uterine lining. &nbsp;At this early stage of prenatal development, the embryo is often called a blastocyst.
<h2>For in-vitro fertilization (IVF)</h2>
In IVF pregnancy, days are usually not indicated by days after ovulation dpo, but by&nbsp;<a href="https://babymed.com/fertility-pregnancy-reproductive-health-glossary">dpdt</a>. which is x days after transfer of a y day embryo transfer. So, if implantation happens on average on 9dpo, then with IVF pregnancies it happens on 4dp5dt: 4 days after a 5-day embryo transfer or 6dp3dt which is 6 days after a 3-day transfer.
See how fertile you are!&nbsp;<a href="https://babymed.com/link-to/implantation-calculator/fertility-questionnaire">Get your personal and free fertility report!</a>
<h2>What happens with the pregnancy hormone hCG during implantation?</h2>
As soon as the blastocyst implants, it emits the <a href="https://babymed.com/normal-hcg-blood-level-by-week-during-pregnancy" target="_self">pregnancy hormone hCG</a> (or human chorionic gonadotropin) into the mother's bloodstream.

The hCG can first be detected in the blood about 3-4 days after implantation, and this is when a positive blood test can <a href="https://babymed.com/online-pregnancy-test" target="_self">confirm a pregnancy</a>. The urine pregnancy test becomes positive 1-2 days later. That is often several days before you expect your next period or around the time of a missed menstrual period.
This implantation calculator will give you the days you may likely experience implantation. It will also let you know when you can expect a <a href="https://babymed.com/pregnancy-tools/when-to-do-the-pregnancy-test-calculator" target="_self">pregnancy test</a> to be positive.
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The getting pregnant and fertility and conception tools are calculators and calendars to help you get pregnant and have a healthy baby.&nbsp;

Fertility Tools

Curious about when implantation might happen? Our implantation calculator is here to help! Implantation is a crucial step in early pregnancy, when the fertilized egg attaches to the uterine wall, and it typically occurs 6-12 days after ovulation. By entering key details like your ovulation date or menstrual date, this calculator can estimate when implantation may occur, giving you a better understanding of your early pregnancy timeline. Whether you're trying to conceive or just want to track your cycle, this tool provides a simple way to anticipate this important milestone.