How many days past +OPK did you test and get BFP?

Rachel
I'm 10dpo based on a +OPK and am 4 days from expected period. I want to start testing tomorrow but afraid I'm setting myself up for failure. I'm sure I will anyway but I'm curious when others got their BFP after a positive OPK? Not necessarily when you "think" you ovulated but from the positive test.... thank you!