I am 15, I had my period on January 1st for about 4-5 days, then I had intercourse on January 7th and 11th. It was protected and he pulls out when he ejaculates. But 4 days after I had sex, I started cramping like a period cramp for about 2 weeks on and off. I got a light light period on February 2nd, and it was weird, I did not need a pad because the blood only came out when i went to the bathroom. None when i woke up or walked, etc. It was red/pink in color and was heavier than spotting but way lighter than a period. About 4 days after that I took a pregnancy test after school. It was negative. After that I haven't thought much of it until this month I am currently 3 days late for my period, with no signs of it coming. I am NOT stressing about being pregnant, I haven't been sick, I don't exercise, The only thing is that I am underweight and lost 3 pounds. But I've had blood tests done for any problems I could have OTHER than pregnancy and everything looked good. so I am confused as to what could be the problem. I have no period or pregnancy symptoms. If i were pregnant I'd be around 8-9 weeks. HELP thank you !!!