I'm sorry if I'm a bit forward here but I think there's some things you should try to "get ready" before TTC. For one thing, I would NEVER consider trying for a baby with a man with whom I haven't shared a home for at least a few years. It's hard enough making a relationship work without a child. You don't know at the moment if you could work as a couple living together, let alone as a family with kids.
Also, how would your OH be involved in the child's life? Can he move in with you? Is he going to be there for nappy changes, bedtime baths etc? How long are you planning to stay at your dad's?
Then: Are you paying your dad rent? Could you afford to move out into your own place if he doesn't want to or can have all three of you (you, OH and baby) live at the house? I think if you live under his roof then you have to respect his wish of not having a baby there to support as well. Having a baby in the house is a HUGE change and I don't think you should willingly force people into it.
How would you support the child? Are you working? Could you afford to stay at home (and be supported by mat pay and/or your OH) or pay for childcare?
I would strongly advice you to wait until you're in a situation that is a bit more baby-friendly, i.e. have your education finished and a stable job, have lived with OH for a while and know you're working well as a team, maybe are married (if that's important to you, it would be to me). This might not be as far away as you think, you can easily achieve these things within a few years. And you're so young, you've got AGES to make this happen.
On a side note: You've mentioned a few times that you've had an unwanted abortion. This worries me a bit. What do you mean by that? Did you naturally miscarry or did you get bullied into having an abortion? If it was the latter then I would strongly advice you to get some support with that as it's not something anyone should have to go through and certainly not alone. Maybe there is a group of women who have gone through similar things near you or there might be a counselling service available to you?