Could... I be pregnant!?

I had unprotected sex with my bf and 5 days later got my period. But now my next cycle is late! Along with nausea, esp. to smells like onions, hand sanitizer, spray cleaner and a few other things that NEVER bothered me before! My boobs are massive and I gained 6 pounds (I've been more fit now than ever)! Im hungry like crazy and I don't have an appite this strong normally. I'm so sleepy I could fall asleep walking. People normally call me "emotionless" I'm crying to stupid crap when I'm alone.   ? I'm constipated. And my skin is surprisingly flawless... Is there a possibility I could be pregnant??