Teen Mom

I am 17, 18 in November and my baby is already 12 weeks and 1 day, I am scared. Baby daddy fucked off, I managed to find the perfect guy and he had his daughter when he was 16, she is the most beautiful thing. I can’t wait till I see my beautiful girl or boy. I am excited don’t get me wrong, I’m just super scared. He’s been through this all which really helps me and he pushes me to do good when it comes to this baby! I am very lucky to have him. But the dad said he’s gonna try to take our child away from me and raise it with his/gets “new mom” I feel crushed. He wanted this baby more than I did... what do I do?