Im On birth control i take it right most of the time but i was suppose to start on the 10th or 11th, i had sex on the 8th and 15th, ive had unprotected sex before and never got pregnant, i have lower right back pain, lower right pelvic pain, it feels like it's going down my leg i feel like im bloated and getting bigger but i think that parts just in my head, ive been lookin and it says some are pregnacy sym. or cyst and other things...idk whats wrong..need help!!