Implantation bleeding and spotting happens 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 that time, the blastocyst is barely visible to the naked eye, probably smaller than the dot above the letter "i".
Trying to conceive and getting pregnant can sometimes be more difficult than expected and many couples want to learn more about how to conceive. While you usually get many lessons in high school and college about how not to conceive, nobody gives you any lessons about how to conceive and improve your chances of getting pregnant.
Implantation is the attachment of the fertilized egg when the blastocyst has completed its travel through the fallopian tube and adheres to the lining of the uterus. Implantation happens about a week after ovulation with a range of 6-12 days after fertilization.
Some BBT temperature charts show signs of implantation such as a triphasic BBT curve (a
rise to a third level of temperatures) or an "implantation dip" (a
one-day decrease in temperatures about a week after ovulation).