Plan B effectiveness?

Melissa

How effective is plan b if it’s taken during your ovulation? My period started on the 19th of October and ended the 26th. I had unprotected sex on the 1st of Nov. The app says I was ovulating but I thought ovulation wasn’t until a week before your next period so that was my fault for not being more careful and having unprotected sex. I’m just curious how effective it will be because I took a plan b two hours after unprotected sex.