But I'm forgetting something important. Maybe there is some mystical point at which children become ours. And maybe it is simply God's providence that decides whether we get there or not. Or with everything in God's power, especially his precious babies, I imagine it wouldn't be a stretch to imagine he treats these things on a case-by-case basis.
In any event, it is up to me to trust that God will grant motherhood in his own time, in his own way. And however it happens, fairness and justice beyond my understanding will be perfect anyway.