Question...

Glow says a certain day I have a 33% chance of pregnancy. Is that supposed to be the day of ovulation or the day before ovulation? I tracked last month with opk and got my positive on that day. But doesn't that mean I ovulate the day after a positive opk (Wondfo brand)? If anyone is an expert and can clear that up for me, I would appreciate it. We will just BD as much as we can anyway.  :)