21 weeks and ornery

I love being pregnant, there is really nothing better then knowing you are carrying a child that you will soon get to hold in your arms and call your own!! But why the heck am I so ornery and mean and whiney all the time?! My husband is sweet and says it's because I'm pregnant, which yes the hormones could be attacking me right now, but I am so tired of waking up and being ornery everyday!! I'm trying to have a better attitude today! Anyone else struggling with this?? I hate it :(