Crunchy effects of pregnancy?

[The Glyphstone]

The Book of Erotic Fantasy has rules on this.

I was going to suggest the BoEF too. Someone on the boards recently said it has two categories of content - 1) well-written and mature, and 2) relevant to the game.

These two never overlap, but the pregnancy rules fit firmly into the first category. On the other hand, they're fairly minor - it divides the pregnancy into three trimesters, with increasing movement penalties and Dexterity penalties through the second and third, and a small Strength penalty during the third.