I Am 16 years old. I was recently on sprintec birth control pills for almost six months and had normal 5-7 day periods. I stopped mid pack on sept.2 but i really was hours late on taking them previously maybe 3-10 hours late. On aug.13,28 && sept 3,12,23 i had unprotected sex. My what seemed normal periods happened on aug. 21-24 && sept.5-10. On Sept. 15 (78 hours) i took a plan b only to spit it back out in the pop and really didnt take it but a little bit. But on sunday sept. 21st i had brownish bleeding but it wasnt normal like it was suppose to be it wasnt heavy or light. Starting monday it got a reddish color but was mainly brownish still and started lighting up. By that night it stopped and nothing happen. Tuesday it started again only to last a good hour and stopped and i also had unprotected sex. Wednesday & thursday i spotted pink and only showed when i wiped myself which was around noon and that was the end of everything. This was a week late to the original date i was suppose to have a period. But lately i have been feeling nausea, headache (not severe), sore nipples, tiredness, frequently peeing, pressure in pelvic area, lower back pain, and pain in my left hip that comes and goes and sometimes on my right hip too. I took a test sept. 26 (negative) Could I Be Pregnant ? What is this ?