I have only used BC when I was taking accutane 12 or so years ago. I had to take it to remain on the medicine. I refuse to ever take it again because of all the weight I gained while taking it. I was able after a while to lose that weight (ha, but I gained it all back after my pregnancies), but I just can't bring myself to ever use it again.
I really hope you're able to figure out how to get the weight off. I'm trying right now to lose weight as well.