Hey cdot!
I'm also seeing an OB and not planning on him or anyone else at the hospital that I plan to birth at home (let alone unassisted!). I will probably take the babies to the hospital after they are born (and we have had sufficient time to bond) and claim that they "came too fast." Even though I doubt they will, lol.
There's not much they can do in that situation. They can't have you arrested or have your kids taken away, because they can't really prove anything. If you gave birth unassisted and didn't go to the hospital afterwards, they might have something to go off of then, but even in those cases, someone actually has to call CPS, and they usually investigate, find out that you were getting prenatal care and that your kids are healthy and happy, and nothing happens.
I think at the very least, I'd get the baby checked out by a pediatrician after it's born (whether it be hours or days), so that you can prove that your children are receiving care.
Oh, and they might freak out if you bring your baby to the hospital after it's born, so be prepared and know your rights.