Implantation Bleeding??

Symone

Okay so I started bleeding yesterday in the middle of having sex with my fiance and I'm still spotting today. There's nothing in the pad (I've worn two since yesterday) just light pink blood when I wipe everytime I go to the bathroom. I'm crampy but if he started my period early, I would have already had a full pad when I woke up this morning. It's unusual for me to bleed during sex anyway, especially into the next day. I'm 11dpo as of today and now 3 days away from my period. I wanna say implantation bleeding but why would it start during sex?