Plan b during ovulation!!

My husband and I had unprotected sex twice. Once 2 days before ovulation and the day before. He “finished” inside both times. The day of ovulation (but I’m pretty sure I ovulated the day before it’s just what glow tells me) we decided that I was going to take plan b.

Yes I know don’t have unprotected sex unless you’re ready. We are but we’re nervous so that’s why the plan b.

Anyways, how effective is plan b during ovulation??