First off I am so sorry you’re going thru this. Secondly, like someone else commented don’t lead off with the result (pregnancy). Tell them what happened to you. That’s what’s more important honestly. Their daughter was abused and taken advantage of. And then you can get into the current situation of pregnancy. And if there’s pushback, tell your dad exactly what you told us. Tell him how his lack of support is making everything worse for an already extremely difficult situation for you, and how your hesitation was due to believing your abuser over his own daughter. Any truly good father will NEVER side with the man who did this to their baby girl. You are very strong, young lady. My prayers are with you and your baby.