I'm still scared

Hannah
So my period is Thursday and I had sex last thursday. We were protected but when he pulled out the condom kind of hung out of me. I have been slightly cramping now that it's 3 days till my period, loss of appetite, no breast soreness, upset stomach, and loads of anxiety. I've been told that I'm extremely stressed and over analyzing. I'm really emotional and not exactly more tired then usual, just your usual before period amount. Yes, I realize any amount of sperm could impregnate me, I'm 18 almost 19. I just need help...