Scared

I had unprotected sex Twice and my next period is in 4 Days and I’m waiting for it Bc idk if he nutted in me or not even tho he said he didn’t. I haven’t been feeling weird like I’ve been feeling fine so idk maybe it’s just nerves lol ..But after the second time I had sex I started to feel a itchy sensation down there and I didn’t feel like this the first time.I did shave before I had sex the second time could it be Bc of shaving or do y’all think it’s something different ?