So after reading an earlier post (Taking Control of Your Fertility) a question developed in my mind. I'm still learning about NFP along with my fiance. However, I'm currently on a BCP. Originally it was to help with period issues. Eventually as I got older that issue went away. However, when I tried going of the BCP it was discovered that I get horrible hormonal mood swings (to the point where they were interfearing with day to day stuff). Thus, my question is this: Can I start charting for NFP while still on a BCP?