Could this be a pregnancy symptom?

Allt his week I have been nauseous, it feels like I could vomit up my entire stomach, but then i just burp, but not like heartburn, nothing comes up just burping, AF is not due until Tuesday, but we did BD during Ovulation, so could I possibly be pregnant or am I just crazy? I am sooo afraid to take a HPT for fear of it being a BFN (AGAIN) :( so what do all you other moms and TTC'ers think? TIA