Dentist while pregnant

My doctor said it's okay and recommended to go to the dentist while pregnant but I am terrified of going. Not only what the cost will end up being. But I haven't been able to see a dentist without laughing gas in as long as I remember. When I think about having to go to the dentist I start feeling physically ill. It absolutely terrifies me. Please don't be rude. I'm sure my feelings towards the dentist are irrational, but it's currently my reality. But anyone have advice to get me over it?

Edit: I do have a fear of the dentist and I know I will need work done