hi, im 17 years old and im currently 3 days late. I'm not usually late at all, i have the usual signs such as slight bloating, breast enlargement and tenderness, slightly moody, cramps etc, but i have no menstual flow. ive been feeling nauseous today, and when i try to eat i feel like im going to be sick, which is unusual for me, i dont know if its from worrying about this or something else... i am sexually active but we always use a condom, i am currently at the end of high school and studying for my final exams, could that be the cause? i'm hoping someone out there has been through something similar and can hopefully tell me whats going on because i'm really scared.