Thanks for the link. I personally wouldn't use this any more than I would use birth control pills to prevent a pregnancy.

Anything where they are "not sure" how it works and needs to be discontinued if a pregnancy occurs wouldn't be for me.

I don't personally believe in messing with natural body functions unless it's absolutely essential for medical reasons. It alarms me how much women mess with their hormones to prevent pregnancy and how little concern their partners show.

I have to have progesterone pills three times a year to clear out the lining of my womb, and I hate that, but it's better than the alternative which is the pill every day.

I would personally use only barrier or NFP, but everyone has to make their own choices.