all i know about planB is that its a morning after pill and once conception happens it wont work. but like the other ladies said take a HPT if your period is late.
The spotting could be a delayed side effect of the Plan B or it could be pregnancy spotting. I would wait for your period and if it's late by even a day, take a test.
I also took Plan B after having sex where the condom broke. It didn't work for me either, I'm now 15 weeks. It's worked for me in the past and I've never spotted or had my period come on after taking it. You could try taking a test now, like First Response or any of the ones that can detect the pregnancy hormone up to 5 days before your period is due. If it's negative I'd wait a week and test again just to be sure. Good luck.
I took plan b a few hrs after unprotected sex but it was too late. Im now 27 wks pregnant. All i can advise is not to panic and just wait for ur period and take a test if it doesn't come. Good luck