Pregnancy and periods

A couple of weeks ago me and my husband had unprotected sex about 5 times and he came inside of me every time. I thought I was pregnant but yesterday I got what I thought was my period. I'm not sure if it is or not. I'm having major cramps and I'm bleeding but I don't know if I should wait and take a pregnancy test just to be sure or what? ADVICE PLEASE!!! I also have PCOS so I don't know if that's a factor of why I can't get pregnant or what...