Can implantation occur a little less than 48 hours after sex? Positive pregnancy test less than 48 hrs after intercourse as well.

Anatomy . Nope. Absolutely not. First: the sperm have to swim through the cervix, through the uterus, out the fallopian tube and find an ovulated egg. This takes more than 48 hours. Second an impregnated egg does not have any connection to the mothers body for over one week after impregnation and even then does not produce enough hormone for the mother's blood to be carrying it. It is impossible to test.