What are the chances to getting pregnant?

Three days after my period, I was messing around with my boyfriend. We were out of condoms, but did have intercourse for a few minutes. He didn’t cum for a good 10-15 mins after our unprotected few mins. He peed probably 30-45 mins prior to messing around ((I heard that it can make a difference with possible pre-cum?🤷🏻‍♀️)) should I take a Plan B just in case?