I am a mother-to-be, but I often dream of going to school and leaving school.

Don't understand dreams. I suggest you see a psychiatrist. It's not that you are sick, but that the psychologist will tell you why and how to deal with it. This has something to do with the change of your role in life. You used to be a student and a child, but now as a wife and mother, you will become nervous and at a loss. You should communicate more with your husband, friends and have a heart-to-heart talk, but don't be nervous.