I dint!! yay!! lol
I was working 60 hours a week until I was 71/2 months pregnant (im a chef) so even then couldnt get any BH or anything! lol
Mind you, if my boobs didt get bigger and my belly didnt get bigger, then i wouldnt have known that i was pregnant - didnt have MS or ANYTHING!!
Christ even my labour was going on for 36 hours, got down to 90-120 sec contractions 2 mins apart and still didnt hurt! lol
I say, just ENJOY it!

Good luck with your birth too!