Had sex @ same time I was supposed to take birth control pill?

I had unprotected sex with my boyfriend midway into my third month on birth control.I usually take my pill at 1:00pm,and I did take it at 1:00pm that day,minutes after engaging in sexual activity.Am I protected from pregnancy?I have never missed a pill,and take them at the same time everyday(sometimes it varies by a few minutes)Any help would be great!:D