This is my first month charting to help me understand my cycle. I have some OPKs and wanted to use them as well as temp and cm recording but have no idea what day of my cycle I should start. I don't want to waste loads, but also don't want to miss the crucial moment!
My cycles over the last year have varied between 26 and 33 days. Anyone with more experience able to tell me when I should start with the OPKs?