Could I be? Should I be? Is there a chance I am?

I had sex for my first time 10 days ago. The condom broke and 4 hours later i took the day after pill. Is there a chance my symptoms are true? Could I really be pregnant. I have headaches, nausea, feeling like I'm gonna throwing up, dizziness, constipation, light headed, spotting, the spotting around my nipples are bigger and a little darker, also I have slight tenderness in my breast. Oh i alsobhace crazy mood swings. I'm not sure if he knew what he was doing but it wasn't his first time. I think I have missed my period I was suppose to start last week... But my period likes to skip sometimes. I never had this feeling before and because I'm no longer a virgin I'm worried...