My mom tries to hurt me in my dreams?

Your dream may infer the torment you feel about the relationship with your mother. You should try to mend the relationship as best you can. Don't try to make her come to terms with the marriage but just as a daughter. Soon, she will come around and be the grandmother to your new baby. When you have smoothed things with her, the dreams will no longer be so harsh and you may even dream of her as a caring parent.