Feeling sick and had short period

Merrisa

So guys. I'm not sure why but here's the story... I started my period like Aug first and stopped yesterday. That's a bit short compared to normal and I'm also hardly able to eat anything. Like I love pizza and I couldn't eat more than half a slice and I've been feeling nauseous all morning but I did drink only water this morning and I'm thinking maybe that's it? I don't know and I haven't been taking the pills like, at all for a few weeks and when I had unprotected sex last it was the day after I stopped my period but I was taking the pills like every other day basically (accidentally cause I kept fucking forgetting)... I'm scared I could be pregnant... Please tell me I'm just freaking myself out.