So I've gotten my periods regularly since I had sex for the 4 months after it, & I've gotten more than 15 negative pregnancy tests. However, if I were pregnant, I would be 15-16 weeks pregnant. I am concerned because sometimes I feel my abdominal muscles twitching. My belly doesn't look 16 weeks nor does it look pregnant. I'm wondering why I get the random belly movements. Could I be pregnant but still have my regular periods & more than 15 negative pregnancy tests? Someone, please help. Thank you

