My "what to expect" does a whole section on pregnancy dreams - from dreaming that you're bleeding, to something wrong with baby, to cheating on OH with the most improbable people but at the same time loving it - to a mixture of all of these! It's all to do with anxiety about the birth, confusion with sexual feelings due to rampaging hormones and fears that you are becoming unattractive and big and awkward....just another sign that you are feeling a bit vulnerable, I suppose.
I've had em all! Every type of weird dream imaginable, including an ex I HATE coming back and me blowing a whistle down the phone at him!
Sue