Is Pregnancy Possible Having Taken Next Choice Within 2 Hours Of Intercourse?

My boyfriend and I had sex yesterday, unprotected. We weren't sure if pre-ejaculation could get you pregnant, so we stopped, and Googled it. Having found out that it could, we started to worry. What if I WAS pregnant? We had his dad take us to go get Next Choice (morning-after pill) and I took it 2 hours after we had unprotected sex. It said to take it within 72 hours, but having taken it 2 hours after, and the next pill 12 hours after that, do you think it would work better, since I took it ASAP?