Try doing a search on birth control - generally bc tends to keep a little extra fat on ya and makes it really hard to finish leaning out. I'm not aware of any interactions between bc and anything else. If you are taking nolvadex or any of the estrogen inhibitors, definitely expect to use an alternative means of birth control as the "anti baby" effect of the bc is basically negated, and you may actually become more prone to pregnancy while taking nolva, proviron, etc. (By "you" I mean your wife or other women...)
But do more research - lots of good stuff on this board!