I just want to remind the OP that pregnancy can turn a docile, sweet, submissive wifey into a raging beast from the depths of.... okay, I took this too far, but having been pregnant three times myself I can tell you that the hormones are over-the-top. Many, many times I couldn't even stand to be me!! Maybe this really does have to do with her present "condition" (can I say it like that?).
Also, your signature doesn't imply you are married. When did she arrive here? How long have you been married?
Good luck