I'm 22 and had sex for the first time 3 weeks ago and I'm 5 days late, last month my period was late by a week because of stress. Should I be worried, I've been pretty stressed out recently and thinking that could be it. I have been feeling like I'm going to get my period, I'm breaking out, breasts hurt and slight cramping. I feel like I'm just being paranoid, if I was pregnant, what would be some symptoms this early?