I need opinions.

So, I got very very drunk to the point of blacking out, yes I know this is unhealthy. Anyways, I woke up half naked next to one of my friends so I asked him if we had sex and he said he doesn't remember either bc he also blacked out. (I trust him) So I don't know if we hooked up or not. I was on the last day of my period(9/2-9/3) I'm just spotting now like I regularly do when my periods coming to an end. I think I'm going to take morning after pill just to be safe. Thoughts?