How long after taking the morning after pill (Plan B) do you have to wait to have again?

I had with my boyfriend and we realized about 10 minutes into the that the condom had slipped off. He didn't *** thankfully because we realized it was off before he could. We still didn't want to take precautions so we got Plan B since I'm not on any alternative birth control yet (this scare induced me to get it this week, asap). I took the pill, so everything should be fine as the chances were slim to begin. How long do i have to wait before i can have again? My expected period is due in about 2 weeks, possibly less, but I'd rather not wait that long... Is it unwise to have before i get my next period to confirm that everything is alright?