for the past few months i have been experiencing cramps in my lower abdomen, and i don't know whats wrong. i have taken three pregnancy tests and they all have came back negative...my stomach is constantly rumbling even when i am not hungry...it is also swelling. i often feel a light bubbly movement in the lower area of my stomach. i gave birth in mid feb. this year, and my baby was stillborn. i started using the NuvaRing about three months ago, could this be it???? HELP PLEASE!!!!!! i don't know whats wrong with me... :'(