Unprotected sex on march 23 and bleeding for 2 days on april 6, 7. april 20 positive pregnancy test, u/s confirmed. was this implantation bleeding?

Correct timing: The timing of "bleeding" about two weeks after the productive episode of sex, suggests implantation bleeding. I trust that you are under the care of a doctor for the sake of your and your baby's health.

YES: Implantation Bleeding occurs 6 to 12 days after conception in about 1/3 of pregnant females. you bleeding could have been IB.