Unprotected sex

On January 30 i had unprotected sex with my boyfriend. I know this was really irresponsible of me, but now i'm getting a bit concerned because I've been having cramps for atleast a week and my belly is swollen up. I don't have to throw up in the morning and I still had my period on the 15th of February. But could it be that I'm pregnant? I can't go get a birth control test because then my parents will suspect something and I don't want them to know:( Please help!