So it's going on about 4 weeks now since i had protected sex, and ever since then I've had a gassy, tight feeling in my abdomen. Went to the doctors to check for pregnancy, it was negative, had a regular menstral cycle that month, and went back to the doctors and yet again it was negative. I don't understand the reason for this uncomfortable feeling that hasnt seemed to subside over the weeks. I'm really nervous that it could be a symptom of pregnancy. This tight and gassy feeling doesn't seem to go away. Is it possible I could be pregnant and is it when you've missed a period that you begin to have symptoms, ( bloating, sore breast) not before? Im just trying to set my mind at ease, please help!!!