Bad pains help!

Kassie
Ive had 4 negative pregnancy test. And I am 2 weeks late. But sore breasts and nipples very moody and emotional and then all the sudden today what I thought was finally period cramps has turned into dull pains in my lower abdomen and back. To the point it almost hurts to move. Anyone experience this could I have been pregnant and miscarrying??? No bleeding though.