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TCOYF is the easiest-to-use, most educational, and most enjoyable fertility tool available. Because it identifies your most fertile days and projects your future fertility, Taking Charge of Your Fertility Software can help you reduce the time to conceive. It has been approved by the US Food and Drug Administration as a fertility diagnostic device and aid-to-conception, a claim no other Windows or Web-based fertility application can make. It is based upon the best selling book, Taking Charge of Your Fertility, by Toni Weschler, MPH and was developed in complete cooperation with Toni, herself. It is the only software application endorsed by the author as a companion to Taking Charge of Your Fertility.