What day after AF to start OPK testing?

Taylor

I’m super new to this and online I found info that differed and was confusing. After over a year of not preventing and about 9 months of tracking I’m starting to get more determined!

opk are very new to me. I’m on period day 3 now so I’m wanting to be prepared. What day after AF is best to start testing? or do you start the next day? I don’t want to miss my window.

Any other tips would be amazing!