I am no longer married nor have I experinced a pregnant lady, but if I adhered to either I would not be playing bloody space invaders.
Tell him to get off his fat arse and rub some E45 in to you swollen belly, or massage you feet or something.
If you feel that intimacy is the last thing on your mind, send him to the shops to buy you some chocolate, low-alcohol wine or whatever food fetish you may be experiencing during your hormonal 9 months.
Bloody men eh?
As for the answer to the question, I haven't a bloody clue.