For me, the nuva-ring has been the only thing that has regulated my periods. I absolutely love it.
FWIW, the Depo shot gave me ostiopenia. It reversed soon after I got off of it, not much changed. But while I was on it it was completely awesome! Worked like a charm.
Not that I am suggesting this as a trustworthy "form" of BC, but do you think it is harder for us CF women to get prego because of thick mucus blocking everything up? Something I have always wondered, but no one has been able to answer me.