because the uterus is under your guts EDIT:and because the uterus is expanding along with embryo.
It all depends. If you are on the slender side, then it might be noticed by other. On the other hand if this is not your first pregnancy then you may already look like you are 5 months because your...
It's the Magic of the movies.... ok it was actuallty a FAT suit used in movies to make the actor look pregnant. didin't you know that?
No
Re-teach the Muscles of the Body
Back Stretch Prenatal Exercise
The Causes of Post-Partum Tummy
How to Stretch for Soccer