Implantation typically occurs about 6 to 10 days after ovulation or fertilization. In natural conception, the fertilized egg travels to the uterus and implants into the uterine lining roughly 6 days after fertilization
. In the context of in vitro fertilization (IVF), implantation usually happens 1 to 5 days after a blastocyst transfer, which is commonly done on day 5 after fertilization. This means implantation occurs approximately 6 to 10 days after egg retrieval and fertilization, aligning closely with natural timing
. Specifically, after a blastocyst embryo transfer, the embryo begins hatching and attaching to the uterus around day 1 to 3 post-transfer, with implantation completing by day 5 post-transfer
. The "window of implantation," when the uterus is most receptive, generally falls between days 20 to 24 of a typical 28-day menstrual cycle, corresponding to about 6 to 10 days after ovulation
. This window is quite narrow, lasting only about 24 to 36 hours, during which the embryo must successfully attach to the uterine lining
. In summary:
- Implantation occurs about 6 to 10 days after fertilization or ovulation.
- In IVF, implantation happens about 1 to 5 days after blastocyst transfer (usually day 5 post-fertilization).
- The uterine "window of implantation" is a short period roughly 20-24 days into the menstrual cycle (6-10 days post-ovulation).
Pregnancy can typically be detected by blood tests about 9 to 14 days after embryo transfer or fertilization, once the hormone hCG is sufficiently secreted
