Helpp!!! might b pregnant?

Ok so I have irregular periods since april and I have always had regular periods til now. I have had several symptoms, have taken four pee tests, all negative. I feel pregnant and I sorta look pregnant but idk if it is just mind games. I have heard tests coming out negative but blood tests being positive. Lately I can feel tension in my abdomen. If I straighten my back backwards I can feel stomach muscles stretching and pulling....any ideas, advice, or anything is greatly appreciated!!!