I don't know how to tell my dad I'm pregnant

I am only 20, single, and 9 weeks pregnant. My mom knows already, she has told her side of the family. But since my parents are divorced I have to tell my dad and his side of the family because my mom refuses to talk to them. My mom has been nothing but supportive throughout this thing because I am scared shitless, but she hasn't given me any advice on how to tell my dad. I don't and can't tell him in a cute way since this was obviously not planned and he absolutely HATES my ex fiance (long story that he already knows the jist of). I have to tell him before I tell the rest of his family because word gets around fast in that family. I have no idea how to tell him and just want some tips/advice any of you mommy's have for me. :\ thanks in advance.