pure anger.

I'm almost 36 weeks pregnant and I feel like I cannot control my anger to save my life. I feel myself getting upset then something will happen and I blow the heck up. Y'all I yelled at my husband today and What happened wasn't his fault. I'm still fuming but as soon as I calm down I'm going to apologize but is any other moms to be getting so infuriated that you just become mean. 
Maybe a lack of sleep? Being 36 weeks pregnant? Nerves?