I can't tell whether it was planned or unplanned. If unplanned you feel ashamed probably for "making a mistake" even though youre married. If planned, I think you're trying to hold onto something you feel you're going to lose with the pregnancy. Maybe you're very scared of what's waiting and hiding the bump is postponing the reality. A lot of people pronouce that they never want kids, and when they eventually do want kids, its like they have to explain themselves. Whatever the reason, hiding the bump is trying to hide the reality - and only from yourself. Don't be too hard on yourself. Relax. You have a life in there. Your baby in your body. Enjoy it. The rest will take care of itself.