Am I crazy?

Hunter

I’m 18 days passed my missed period, I just got off my birth control in January thinking it was time to start trying for a family, and I thought this was it. I’m nauseas and crampy, moody and my breast hurt. Everything you’d expect if you may be pregnant but I’ve taken two tests and both have come up negative. I feel crazy and I just don’t know, at this point if I was pregnant I should be testing positive be now, right?