"You have wrecked your marriage...but at least you acknowledge that"
For goodness sake, such melodrama is just not helpful!
"You did the worst thing imaginable?"
Again, over-dramtatic. Did she murder anyone?
When I was pregnant, my hormones went completely throught the roof, to be honest, if my husband had rejected me sexually I would probably have dragged the milkman off the street!
What's done is done, no point in spending the rest of your life beating yourself up about it.
To be honest, I don't think I would be attracted to a man who admitted he didn't find pregnant women attractive. I would consider him to be emotionally immature. It would be a major turn-off for me.
For what it's worth, when a woman is pregnant, or has a very young child to look after, is a prime time for men to stray and have affairs. I presume often because they feel neglected but maybe also because they no longer see their partner primarily as a sexual partner.
You have my sympathies, if my partner had rejected me sexually when I was pregnant, that would be - a deal breaker, actually as it would have made me question him as a man.
But, having said that, if you both want to move forward it does sound as though you need to talk about how you both feel. What you did is a symptom not a cause.