BTW even those who wish to have a child do not always succeed. Even if there is only a 1 in 100 chance the zygote will survive to term there is no "sin" in trying knowing full well that most of the attempts will fail.
Sure, but intentionally or neglectfully allowing one that had a chance -- even a poor chance --- to live very well may be a sin.
I don't know if it is a sin --- heck, or even if a zygote is a "life." No one does.
Ergo, the reasonable solution to me is possible sin-avoidence. It's not that difficult.
You are certainly free to take the risk. I choose not to. Your choice is between you and God.