What's the difference? A spectrum of possibilities... There are a lot of fertility charting methods out there, and many share similarities. It can be fascinating to delve into the differences between sympto-thermal methods! I’ve been asked to explain the difference between the BCC and Marquette methods. Other cool things from the 70's! Let’s start with origins. BCC began as a sympto-thermal method in the late 1970’s, originally using a Billings Ovulation Method approach to ce