My girlfriend and i were getting it on and the condom slipped off, after i blew my load in the condom. After that i kept going and then realized that the condom had come off. So the next day about 12 hours after words i got plan b and she took it. But the thing is she just got off her period a day or two before we had sex. When is it likely that she will see her period, or should i go get pregnancy tests to make her check every few days?