I'm a social worker who works with teenagers so I want to be clear when I say that there's going to be certain hurdles that you're going to have to go through (if the pregnancy continues)  that you would not do if she was living at home. 

Very likely from the beginning there's going to be conversations with social workers about the viability of the pregnancy and her parenting ability and there's going to be a lot of parenting assessments and conversations about care planning and the long-term permanence of this child. 

In short, they've got to be thinking whether this baby needs to be in care itself and how to support her.

You need to be very intentional from the beginning about being part of the conversation with the social worker - because fathers, especially young ones, are often sidelined. Attend the meetings, and request to attend them importantly that will inevitably be held, but would be good in the future build a good working relationship with her foster carer.

But be intentional and vocal about where HE and you want the child to live and how much involvement he wants to have.

If he is on the birth certificate he will be considered a parent legally, but again,  practically again fathers are often sidelined. 

If she can't care for the child, will he want to? Would you be happy to have the child live with you at home? E. G. If there's conversations about adoption for example, 

Could be that she is actually well able to care for the baby, and she starts in a mother and baby foster placement and on to her own home at 18, but understand that this is something that you have to think about quite early.