Word for word what @mathanxiety has written.
You are at a crossroads of your marriage and how he behaves will not be something you will forget.
Being married to a man who doesn't put you and his children first is soul destroying and will kill your respect and regard for him.
Having manipulative in laws who don't respect you, your home, or your right to privacy, will destroy your marriage.
If your husband insists on disregarding the views and wishes of his pregnant wife, you would do well to view your marriage very differently going forward.
Have you family to go to?
Because you would be better with them than a man who doesn't take your views into account.
Don't give up your job and go back to work.
Marriages where in laws rule the roost are ones that women are more likely to leave and are happier when they do IME.
Decide what you want now from your marriage and your life.
Because if you accept being over ruled in your own home at this point in time , I honestly wouldn't give your marriage much chance of success.