I did have plans for a pregnancy theme pack, but the problem is that the time scale doesn't make any sense. For it to really be something impactful, you'd want to have pregnancy and give birth several times a round. but that would make each round a couple years long at the minimum. It just doesn't make sense. And if you explain it away through some kind of hyper-accelerated pregnancy or something, is your character giving birth every few days or something? That sounds like hell, not something sexy.