I am four weeks pregnant. Last night I woke up. Went to the bathroom and pee'd. When I came back to bed my uterus was in gripping pain. Not like a cramp. More like growing pains that just kept holding on. My lower back and my lower stomach were so hot and it came in waves of pain. It last ten minutes. And I was having to breathe through the pain. It only gradually went away when I turn my knees in one direction and my shoulders in the other. As if my body was in a Z position. I have had zero spotting, all my blood work came back yesterday all showing great results, and I took another test today and still two solid lines.