IM 18 years old, and recently a little over a month ago lost my virginity to my boyfriend of almost 4 years. Ive been beyond stressed of the idea of being pregnant and was wondering if i should worry myself over the idea. Ive been on birth control for 6-7 months now and we use a back up birth control which is a condom and he pulls out before he ejaculates. We take ever precaution and now because im so worried we've stopped having sex. The period i got right after i had sex was only about 3 days long im not sure if thats a sign of pregnancy or if its because of stress and just yesterday morning i woke up with really sore breasts. And again im not sure if that is stress or a sign of being pregnant. Im just really worried and my mom thinks if i keep stressing myself im going to cause and ulcer. I was just wonering what somebody else thinks.Hopefully you can reply so maybe i can be at ease. Thanks so Much!