I have dreams like that too - even before I was pregnant - dreams rarely mean the same thing in life so don't panic - but still it's not a nice experience and it effects you for the rest of the day.

I keep dreaming that I have an evil baby - like Rosemary's Baby or something - it always has a horrible personality in my dreams and I'm really frightened of it!!

I think it's natural to dream about the baby - it's in the forefront of your subconscious all the time!