Pregnancy chances if semen drips out during anal sex?

angel

I’m quite a paranoid person so sorry for the ‘silly question’ 😅 my bf will be wearing a condom anyways but what are the chances that the condom could break during/after anal sex (I read the chances were higher than vaginal sex) AND the semen drips out over my vulva AND causes a pregnancy?? we will be using lots of silicone based lube but I wonder if there’s any other measures that we can take to reduce the risk? Or is the risk just not something worth worrying about? (I cannot go on hormonal birth control due to health reasons)

Thank you for reading :)