I need help.

Firstly you need to consult a lawyer. Do your search and homework properly. If the baby really belongs to your Ex, you may need to do a DNA test to submit to the court. All these will require time and lots of documentation. If your pregnancy is still at the early stage, you might want to discuss with your Ex and his family. If your pregnancy is at the last trimester, you may have to wait till you deliver your baby and do the necessities. Take care. Good luck.