Can I possibly be pregnant?

My husband and I have been trying for 4 months now to get pregnant. A week and a half before I was supposed to start my period I was having really unusual cramping way low down in my abdomen felt more like in my uterus. It would happen mostly at night while I was sleeping. But then I started bleeding like a normal period 4 days earlier than i was supposed to start my period? I was thinking I could possibly be pregnant since I also have been extremely nauseous and haven’t really felt like eating because nothing sounds good. Sounds stupid but I’m tired of taking pregnancy tests and them coming out negative and having to waste a bunch of expensive pregnancy tests and dealing with the disappointment of it being negative :( should I take another test just to be sure or just wait?