Please hellllpppp!!!

Well I had sex with my bf in the shower but before we started it , I gave him a BJ in the shower and he came, after that he cleaned his penis and then we had sex without a condom "he didn't came or anything". two days after my period came but the 3rd day was weird my period flow was light . Now it has been a week and a half and I'm feeling nauseous, like I'm full so I want to know if there is a chance that I can be pregnant or it's just that I'm stressed out?
Please help idk what to do!!