I am SO happy your parents are in support of you. Don't blame your Dad, that was most likely his knee-jerk reaction to his "little girl" being pregnant.
You are so brave to have told them, I'm sure it was very hard for you.... one step in the right direction! Now you can do anything!
As for the father, as of right this moment, do what ever is best for your pregnancy. If it's stressing you out, let it go for awhile, you need to focus on you & the baby, everyone else gets a back seat for now!
But I do think that the father has a right to know. Maybe you can find a way to tell him before the baby is born, or shortly after. Even if he does not want to be involved at all, even if he does not pay a cent of child support, even if he never comes to see his child, this baby will one day grow up and look you in the eye and ask about it's father....and you owe that child to at least have given it's father the opportunity to be a father. That's my opinion. If you don't, your child will resent you....you
will be the one who took away the opportunity to have a dad, and the dad will be the hero cause he can always say "I never knew" or "I would've been there for you had I known". If you tell him, and he's not involved, that's his choice. And you can always leave the ball in his court, ask him does he want to be a part of this babies life? How much? Get it all legal. I cannot stress enough. Make sure you have full sole custody. Then you are responsible for all of the decision making, and he does not have a say in it. He can still have visitation of the child, but doesn't say where the child goes to school, or whether you raise it Christian etc. You are a brave young woman! I am very envious of you, and want you to know that you are creating a life, a wonderful little miracle. You are courageous and responsible, and those are very admirable qualities! The road before you will not be easy, but it will be rewarding just the same! Good luck to you!!!