Aftera - Did my Plan B work?

I believe you're trying to ask if Plan B would prevent pregnancy if you were on your 2nd fertile day of your menstrual cycle. I've based my answer on that assumption, so please correct me if that's not the case.

Your ovulation only lasts for a few hours, during your fertile window.
The only emergency contraceptive pill that is proven can prevent pregnancy during the 24 hours around your ovulation, is Ella (Ulipristal Acetate) and even that drug is not guaranteed to prevent it. You can see that it's the only drug proven can prevent pregnancy at that time, on the Manufacturer's (Ella's) website.

Plan B might work for you, but it has not been proven when at that point of your fertile window.

Here in the UK, a pharmacist is directed to give someone who is anywhere in their fertile window/time, Ella, for that reason.

Unless you're using an ovulation test, you may not know exactly at what point you ovulate, just that you are fertile. You may have had more than 24 hours before you ovulated.

I do not advise trying to use Ella, now, because you've already used Plan B. If you use both, they may cancel each other out (they do not know for certain as Ella is a relatively new drug), & you could end up with neither drug preventing pregnancy.

The only other thing you could do, if you are still within 5 days/120 hours of when you had sexual intercourse, is have a doctor fit a Paragard IUD in your uterus. That can act as emergency contraception, if fitted within 5 days/120 hours of the unprotected sex. Again, it's not guaranteed. It can also be left in place, as longer term contraception, too.