Hello. I'm 19 Sexually Active. Overweight. I Have Pcos, Along

Hello. I'm 19 sexually active. Overweight. I have pcos, along with the insulin resistance. I took two home pregnancy tests and both came up negative but I have all the signs of pregnancy. Yesterday out with some friends I noticed every time I coughed, sneezed or moved really, my uterus was very sore. It's not in my butt that I feel it, not in my vagina either but in the middle. It also hurts to push stool or to push urine out. Should I consider a blood pregnancy test? What else could it be?