Counterpoint: any time one has non-reproductive PIV sex, one creates a fork in the timeline where the contraceptives failed and the result was carried to term.
Lo, the king of Ephyra cannot get his rock up the hill without it rolling down; meanwhile this guy cannot get his rocks off without knocking someone up. This is indeed what we in the biz like to call a "Sisyphean creampie".
In fact, every single moment during the course of a pregnancy creates those forks again and again and again and again, and a simple miscarriage is by all means the least horrifying of these timelines.
Incidentally, it is believed that the vast majority of human pregnancies do not last to term, but of that vast majority, it is most common for pregnancy loss to happen before one is even aware one is pregnant.