u/PadraiginNiCarra

Hello, folks. Apologies if this should go elsewhere.

My fiance and I are planning to use TCYOF when TTA after we're married. I've been preemptively charting for 10 months at this point and I have PCOS that I manage through nutrition and exercise.

I know the first rule for TCYOF is that you are safe on the first 5 days of the menstrual cycle if you have had an obvious thermal shift about 12 to 16 days before.

However, my thermal shift usually happens about 10 days before my period begins. The longest space between my thermal shift that I've recorded thus far is 12 days.

How ought I apply this rule given the nature of my thermal shifts?