Any inputs?

So I have taken so many pregnancy test the past month or a little more, and they all say negative. But I'm constantly nauseous, boob's hurt like hell, and so so tired no matter how much I sleep. I get so ill at work when I smell certain things, especially meat or bread. Besides the obvious stomach bulge that's hard right where my uterus is... I truly feel pregnant. Has anyone ever experienced something like this? Could I be pregnant and need to get blood test done since it won't show on a pee test or am I just crazy and it could be something else...? I know y'all aren't doctors, but give me your input!