do I have PPD?

After having my daughter a little over 3 months ago, I find myself irritable, fatigue, snappy, emotional and angry with my fiancé. We've been fighting so much because he can make me so mad. Something as little as leaving his socks on our baby's change table makes me lose it. Sometimes I get so mad and upset that I just turn on the shower and cry in the tub and my fiancé will come knocking and try to comfort me. He'll wanna talk about our problems but I can't because it gets me mad all over again and then we fight. I don't know what's going on with me and why I've been taking it out on him. Could I have Post partum depression?