I heard some mom have bad temper, don't worry as it's due to hormonal changes. It's good to let your husband and family know about it, hope they understand this temper or situation cannot be controlled by you.
For me, I don't have emotional problem in the last pregnancy. I am always happy and optimistic. However, after giving birth to bb, it's quite emotional in the first month as the hormone changes suddently. I explained to husband and he understood, and would not argue with me because he said it's useless as I didn't have 'normal and rational' reasoning and thinking at the time.