Yes, this is your husband's child. You would have conceived in July. Too bad because the relationship issues sound very serious. You cheated to be vengeful, he is willing to be emotionally antagonistic to a pregnant woman, there is a lot of anger in the relationship, etcetera. I would say that besides being in the hospital, you two need to be in counseling, separately and together, to decide what to do about your marriage and how to retain some kind of at least a civil relationship for the sake of being parents together even if you decide not to stay married. I'm sorry it's this way, your goal needs to be to get to a place where the anger does not poison the child's world.