I don't think you should have said anything. You simply should have said the baby is due in 8 weeks. Adding the additional stuff IMO was YOU trying to GUILT him into not going to see OW.
This action was manipulative. What it tells me is that YOU still feel that you can some how talk your way out of this. That somehow you can fix this. That somehow you can "convince" him to return.
You may not want to hear this BUT it comes across as needy. As lacking self worth, lacking self esteem.
Do you think your H will return to someone that he feels is needy, someone that he feels is trying to manipulate him using guilt?
I am not a women (Grit no comments please) so I may not understand how your emotions may be all over the place as a result of being pregnant BUT let me ask you this....
What do you find attractive in a partner?
Confidence or neediness?
Manipulation or trust?
Anger or compassion?
Be what YOU want in a partner.
You can do better and you know it. The anger - let it go it does you no good and is killing any chance you have of saving this.
Okay
God Bless Eriç
"The difficulties of Life are intended to make us BETTER,not bitter". "Fear is a prison, where you are the jailer. FREE YOURSELF!" "Life is usually all about how you handle Plan B." - Jack3Beans