Should i take a plan B

We were having protected sex, I was on top, and after a while everything feels too wet and I decided to stop. He then tells me he had finished a few seconds before I had gotten off of him and while the condom didn’t break, the only doubt i have is if I should still take a plan b because he suspects that when he finished, semen might have gotten out through the bottom of the condom. Could that actually happen? Or was the excessive wetness was just my fluids?