Hey.
I'm really sorry you're having such a rough time at the moment.
My step sister is in a similar situation to you, only maybe worse as she has 4 kids who were taken by social services and adopted to she can't even see them & has no chance of getting them back.
That was a year ago & she's now pregnant again (due 3 weeks after me). She's facing the possibility of them taking her baby as soon as she's born and if not then, possibly when she's a toddler. The whole family was really angry at her for getting pregnant again so soon after her kids were taken, not to be nasty but because they cared about her and knew how painful it would be to see her have to go through that again.
Just remember that however your dad reacts, it's only going to be because he's concerned for you and the baby. In this country I think that at times social services can be to hard on people but at the same time they can be really blind to situaltions where there help is really needed.
Like my step sister, all you can do is do your best to prove to them that you can care for you baby. I really hope it works out well for you and you have some support. Try not to let the situation bring you down too much or your just playing into their hands.