Levonelle (Plan B/morning after pill)?

It might.
The only emergency contraceptive pill proven can prevent pregnancy during the 24 hours around (& during) ovulation, is Ella (Ulipristal Acetate). You can see that on the Ella website. That is what pharmacists here in England prescribe, if you are anywhere in your fertile window.

Plan B (Levonorgestrel) might help, at that time, but it has not been proven.

Even Ella isn't guaranteed.

However, you are saying that you had 48 hours to go before your hours of ovulation. If that's definitely the case (the only way you'd know is via an ovulation test, or by having charted your fertility symptoms in advance), then there's a decent chance Levonorgestrel will work to delay your ovulation. It's thought it might work in other ways, too, but not proven.

If you want an extra method of emergency contraception, you can have a Paragard IUD fitted by a doctor within 5 days/120 hours of the unprotected sex. That can stop the pregnancy implanting, & act as longer term contraception, too.