How to tell parents

Ashlee • 20 years young (: ttc rainbow baby. baby dust and sticky baby's to all!
Well more like how to tell my dad, he hates my BF, and straight up told him if he got my pregnant, there were going to be issues between them. My dad is very old fashion and because of the way my bf looks (tattooed and gauged ears, etc) he instantly judged him and does not think he is good enough for me. We have been together over 2 years now and I just want my dad to be happy for me when I tell him, but I don't think that is going to happen. What is the best way to tell him?