We always use condoms when we play with others but this guy was fucking my wife with this massive BBC and shredded the condom. No one know it until he pulled out and cum was pouring out of wife's pussy. We were a little nervous for a couple of months and still joke about how old the kid would be if she got pregnant.
Accidents do happen. Unintentional is a surprise to both parties. That is something that you deal with.