Its probably Cruz your subconscious knows your bigger than what you think or doc thinks you should be, so you brain is screwing with you at night. When I first found out I was pregnant I had a scare of miscarry and with that cam terrible vivid dreams, but know miscarry. I guess its possible to be hiding a baby bit I doubt it. GOOD LUCK AND CONGRATS !!!
I have had these dreams too especially now that baby kicks and he kicks everywhere all at once it makes me think that its possible but I completely get what your saying and im 27 weeks 1 day lol