The first day of my last period was July 30. About two weeks later I started having mild cramping and a dull ache in my uterus. I also feel pressure when having sex. I am actively trying to get pregnant. What could possibly be causing this pain? It has been over 1 week that the cramping started. I am not due for my period for another week according to my 28 day cycle and have not experiencd this before. Please help.