Losing it?

I am coming over this guy's (not my boyfriend but we like each other.....) apartment this weekend (we hung out last weekend too and we made out and went to second base but not for me bc I had my period) and I'm not sure what's going to happen next after all that stuff we did last week. Either he's gonna do oral to me or fuck me. Any thoughts? I mean he's really nice and I trust him a lot. I'm just afraid I'll regret it.