How Long From Conception Is Implantation?
To understand how long it takes from conception to implantation, you need to understand what the terms mean, and what happens in the whole process of conception and implantation.
Conception, in this context, is assumed to mean the fertilization of the egg by the sperm. The physical act of sexual intercourse can occur anywhere from a 5 days to a couple of hours before an egg becomes fertilized, as sperm can survive up to 5 days after ejaculation.
Implantation refers to the process in which the fertilized egg, also known as the blastocyst, becomes attached to the wall of the uterus and starts to produce hCG (Human Chorionic Gonadotropin). As hCG is the hormone that pregnancy tests look for, implantation needs to occur before a pregnancy can be detected through a pregnancy test.
If an egg is going to be fertilized and conception is going to occur, it will have to happen within 12 to 24 hours after ovulation. The egg won’t survive in the fallopian tube longer than this. Once the egg is fertilized, it will travel to the uterus for implantation. As it travels, it will continue to grow in size, its cells dividing and reproducing. The process of traveling and implanting will take somewhere around 7 to 10 days altogether.
Implantation can sometimes cause a bit of spotting or bleeding, known as implantation bleeding. Implantation bleeding is a small amount of bleeding in the uterus that occurs when the egg implants into the uterus. A specific tissue, known as trophoblast, develops from the fertilized egg and it surrounds it. It attaches the egg to the inside of the uterus, and basically eats its way into the uterus. The trophoblast pulls the egg to the inside of the endometrium. Trophoblast even invades the mother’s blood vessels and diverts her blood to the fertilized egg. Sometimes, this blood will leak and this causes implantation bleeding.
Thus, it can take as many as 7 to 14 days between the time of sexual intercourse and the time that the fertilized egg implants in the uterus.