The best comment from w1,k1, sums everything up when we were arguing - "stop trying to talk logical to me while I am being illogical. " There was no counter arguing that!!!

Make sure you either pre plan or mark on your calendar to send her flowers or a card saying you love her so it seems out of the blue. She will feel vulnerable and unattractive, and if you let her be that way, she may look for another after she weens the baby. Make her feel secure and beautiful. Tell her (but not too often) how beautiful she looks pregnant, even if it isn't true.

I added some text, so re read it to get everything.