10 weeks should be enough. I was on it for about the same period of time and I'm up to about 1.5 ounces per pumping session. (some times less) Although I increased my dom when I seemed to get stuck at 1 ounce per session.
I started pumping early though in case our birth mom went into labor early. I've been pumping for 4 weeks now.
But to answer your question I'd stay on the BCP at least 2 months if not the entire 10 weeks.
Last edited by hvnsnt; 03/15/10 11:19 AM.