pregnant?

Hello everyone! I'm not gonna give all the details but I have polycystic ovarian syndrome and my period averages about every 8 weeks. however I have missed my period and it's a week late. I've been feeling super nauseas after eating and tired alot more than usual. the last time I had sex was about two months ago and it was unprotected. I knew what I was getting myself into then so please don't be rude. I'd be fine with being pregnant. also I took a pregnancy test actually two of them the first day I missed and about two days ago and both were negative. could I be getting false negatives ? advice?