Is it normal to get huge boobs so early?!

I'm barely 8 weeks but I've gone from 32B/C to a 32DD/F. I mean, I knew they'd get big eventually, but I wasn't expecting 3 cup sizes by the second month!

I haven't really gained much weight maybe a pound or two it looks fairly noticeable on my 5'4" 115lb self.

This leads me to wonder how big are they going to get... Anyone else experiencing the same thing?