help appreciated

sometime in the middle of September i started birth control on the first day of my period. Well like 2 weeks later i had been miserable, cramping, depressed, for the whole 2 weeks, so i stopped taking it(probably not a good idea) i started another period the next day. i can't remember how long it lasted. ANYWAY: the past 2 weeks my breasts have continuously gotten more sore& when I stand up i get a very uncomfortable clenched up feeling in my uterus where I'd normally be getting cramps. but it only happens when i stand up?? could I have gotten pregnant?