Withdrawal during pregnancy

Calina • Married to a wonderful man. Proud mommy of Kylen 9/29/2011 and my Angel baby Adrienne born sleeping on 9/24/2009. Pregnant! due 9/7/2015.
Is it normal not to want to be around people during pregnancy? I feel like it has become harder to talk to people or even look them in the eyes. I am almost 5 weeks, so still very early. When I am around people for a long time I start to get moody and short. My mood swings do NOT help either. Has anybody else felt this way? I feel bad because I am often mean to people, and I know I'm doing it but I can't stop. I just want to be alone. :-\