Emotions!!!

Is any one else a mess? I'm fine most of the day but every now and then I just cry over the stupidest things or get angry at things I wouldn't usually. 
This morning my son spilled some vegetable oil and I felt so mad. Usually I'm so mellow with him. I resisted the urge to show him my anger but then he managed to knock the bowl of muffin batter off of the counter too; completely by accident but then I lost it I just sat down in the middle of my kitchen and cried not only bc I was upset but bc I felt so bad for feeling angry... These emotions are so not me!! 
My son probably thinks I've lost my mind and I'm wondering the same myself. Please tell
Me I'm not the only one with haywire emotions... 33 weeks along