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Start now. Ideally, u wanna temp while AF is present so u can have a full view of where temps lie within the cycle, but def start now. When u start OPK's is dependent on how long ur cycles are.

Thanks dakotagurrl. I also got some additional info in the help section. My cycles are typically 26 days and I think I ovulate on cd12. Going get a bbt today and will start temping in the morning.

Ah ok, that def helps. If ur cycles are 26 days, u wanna start testing CD7-8ish. The avg luteal phase length is 14 days, the longest is 16 days. So always go with the longest (until u have a chart or two to refer to for ur own length). So 16 days LP plus 1 day for O =17 days, then add a day or two so ur testing before actual O day, so 19 days. 26 - 19 is 7. As I said before, this is based on the longest luteal phase and once u have a cycle or two charted, u may find u have this or less and u can adjust testing time accordingly...u def dont wanna miss the window by assuming and testing too late, so testing early for at least this cycle, will only benefit u.
Good luck! =))