Nauseous?

I don’t know if I wrote this in the correct group but anyways.. I’ve been nauseous a lot for a while now and I’ve never had that issue before?? One time it was so bad that I threw up for 20 mins after drinking Iced tea lmaoo idk if im pregnant. its hard to tell because my period is irregular. A doctor prescribed me Diane-35 because I may have PCOS and idk if they’re are the side effects of not using them anymore?? Im almost 4 months late. Does anyone else have the same problem?