I got lot of the white milky discharge too and I'm only 28wks. My doc told me it's normal and just buy a ton of white panties to change thru out the day. I was wearing panties liners for a while but they are starting to irritate my skin. So now I go thru at least three pair of panties a day :(
I don't know how regular it is for you, but I had a ton of that discharge throughout my entire pregnancy! It's normal, and unless it changes in color/odor, I wouldn't worry about it!