My boobs didn't enlarge at all. Actually they did got bigger at the very beginning of pregnancy, but then they  got smaller again and I would say they are at my normal seize pre-pregnancy. I'm now 30w. 
 I've been reading how they leak or how they enlarge etc..I'm not experiencing any of this and I wanted to know if other mommy to be were like me?? Not that I want them big, just to put extra weight on my back to carry, but was just concern if that means something!
Thanks everyone