When would I ovulate after taking Plan B?

The only emergency contraceptive pill proven can prevent pregnancy during the 24 hours around ovulation, is Ella (Ulipristal Acetate), & even that's not guaranteed. You can see that on the Ella website. Plan B might work, but it has never been proven.

So Plan B may not have delayed your ovulation, but if it did, it's not really known how long it delayed it for, as every woman is different.

If you were relying on an app or website to predict your ovulation hours, they are just guides. Charting your fertility symptoms, or doing an ovulation test, is the only way to know.

In the situation when you think you're that close to ovulation, I'd definitely use Ella, instead.

If you're still within 5 days/120 hours of the unprotected sex, you can have a Paragard IUD fitted by a doctor. That can prevent a pregnancy implanting, & remain in place for longer term contraception.