Did i give him the wrong idea?

Last week i had sex with this guy, really nice person. And tonight he is coming over again, i mentioned my dad wasn't home when i said we could hang at my place. I obviously thought it would be possible we will have sex again but now i'm on my period. I know it's absolutely not my 'fault' or something but i still feel kind of guilty?? Like he will probably make a move and then i will have to say we can't do it. For the first time i'm nervous about a guy coming over.. Did i give him to much of the wrong idea? Will this look like a bootycall to him?