am i pregnant??

i just finished having sex with my boyfriend. we had protected sex, but right before he was about to cum, he took the condom off and came in my mouth. then, we put the condom back on and i sucked his dick (with the condom on) and continued having sex. is there a chance the cum in my mouth could've transferred onto the condom and into my vag? please help, ASAP! i'm planning on buying plan B right now..