Letting people know about a pregnancy?

So, someone I know a girl who is separated from her husband, and they have a little girl together. The girl just found out that she is almost 2 months pregnant. She told her brother and mother and they said to think about abortion, but she's against it. She already loves this baby. The father of this baby knows and is very excited. He's already offered support and to move in together so that they can raise the baby as a family. She is in love with him. She doesn't not know how to tell her daughter's father about the new baby. She is expecting him to flip out, and is afraid of losing her daughter. She already has high anxiety, and this whole situation is making it worse. Any advice?