first doctor appt

So I'm in a situation where I could be pregnant. My best friend wants to go to the appt with me to find out but I don't want my so to be mad that he wasn't the first to find out. Also what if they do an ultrasound and he isn't there for it I don't want him mad at me. But I want to surprise him if we are. Please any advice because I'm honestly confused on what is the best thing to do.