How quick did a BFP show using OPK?

Caitlin • 24 - PA - Happily Married - TTC#1
Currently on my AF.. As soon as she leaves, I'm going to start using my OPK. I've never used them before and we've been TTC for 9 months now. How quickly did you get your BFP when you were testing. I'm going to test daily 2x a day, any input would be great!😊