comdom break.. chances of pregnacy??

so there was semen already on his penis before he put on the condom because we previously did stuff a few minutes before.. so we're getting in on or whatever ya know and the condom breaks.. we stop almost immediately.. but i was wondering if there was a chance or getting prego from that.. and it was during ovulation.. sorry if this is a dumb question but im worried... and its too late for plan b..