Was she married before? Why is she a single mother? If she was married before and her husband is still alive, I don’t think you are permitted to marry her. I would rather say she reconcile with her former husband, since they were married. If the situation is that she just got pregnant for a guy who she is not married to and they did not eventually marry, you can go ahead. You should also be aware that she is totally through with her baby daddy.
I also believe that you are going to accept her child as yours and take care of the baby. No discrimination of any type…. If you would marry her.
All the best,