Implantation bleeding

Leanne

What does implantation bleeding look like? Had sex with my husband last night and during clean up I had dark discharge. I put a pad on and there was nothing in the morning. We had sex this afternoon and there was a spot of red blood during clean up. Still nothing when I pee and wipe or in my pad. Is this implantation bleeding? When can you tell with a home pregnancy test after implantation bleeding??