what are the chances i'm pregnant

okay, so this weekend i was supposed to start the 4 period placebo pills on my birth control but after taking one i decided i wanted to skip this period so i doubled up that day, taking a placebo and a normal pill from the next pack. however that left me with a day of no pill (yes in hindsight that was really dumb). so i didn't take one one day. but i also had sex that day. my boyfriend and i went one round with a condom but the second one he went in raw but pulled out. my worry is that there was still semen on him when he went in the second time or that semen came out with the precum. 
thoughts?? i know the chances are probably low i'm just paranoid! pls let me know