A Question About Levonelle (Morning After Pill.)?

Hi there! I was asked a really awkward question by one of my friends this morning and don't know the answer so thought I'd come in here to see if anyone else knew?

Basically she had unprotected sex on Friday (first time this has happened to her) and went to get Levonelle this morning after we told her you can take up to three days afterwards.

She took it this morning with an hour to spare, but then told us that she's ovulating (she also has ovulation pains) and asked if it'd still work. I'm really not sure, as all I do know is,between 49-72 hours the effectiveness of the pill drops to 58% and then once the 72 hours are up you're too late to take the pill.

Has anyone else used Levonelle before under similar circumstances? What happened?

Thanks in advance! :D