Taking Charge of Your Fertility. Awesome book. And the website is www.ovusoft.com , ton of great info! I charted for "birth control" for a few months before we decided to get pregnant again. I then used charting temperatures & cervical fluids so we knew exactly what days I was fertile. I'm planning on starting charting again soon, as birth control again, still haven't gotten af back, ds is 11mos. old now.