Implantation is the attachment of the fertilized egg to the uterine lining. This happens when the fertilized egg (now called a blastocyst) has completed its travel through the fallopian tube and adheres to the lining of the uterus. Implantation happens on average 9 days after ovulation and fertilization with a range of between 6 and12 days.
Implantation bleeding is just one of several typical pregnancy symptoms
and happens around the time of implantation. Implantation bleeding is often also called implantation spotting. Implantation bleeding or spotting does not usually look like a regular menstrual period but is scanty and usually a pinkish or brownish discharge. and it usually happens around 6-12 days after ovulation and fertilization, within 1-2 days after arrival of the blastocyst in the uterus, usually around 9 days after ovulation (dpo), with a range of 6-12 days.
At the time of implantation bleeding, the blastocyst is barely visible to the naked eye, probably smaller than the dot above the letter "i." Once implantation happens the blastocyst becomes the embryo.
The blood pregnancy test usually becomes positive within 3-4 days after implantation, and the urine pregnancy test usually becomes positive 4-5 days after implantation.