Staying the night at my boyfriend's for the first time?

So I'm 18 and have really bad anxiety so I stopped having sleepovers like freshman year of HS because they would make me nervous and I would always wanna go home. Well my boyfriend lives like an hour and a half away and I'm finally sleeping over his house after like 2 years of him sleeping at mine (he's very understanding). I'm kinda nervous and keep thinking about all the what it's that could happen. I also have my period😰 I know I'll have fun if I let myself. Any tips??