how did y’all tell y’all dad y’all were pregnant.

i’m 21, don’t live with my dad, never have, i don’t ask him for anything. he really hasn’t done for me in years. but he’s still in my life.. like we talk every now and then considering i live with his mom. i have my own car ( he did help with that and the only thing he did was buy a battery that i appreciate) I go to school full time and i recently went PRN at my hospital, but when school ends i’m gonna go back twice a week. i make decent money working here, but i’m still scared to tell him i’m pregnant. he’s very strict and i don’t know how to tell him. i don’t want to get the long speech but i have to tell him sooner than later because it’s bothering me. i’m only 4 weeks but i found out at 3 weeks and 4 days. any advice? should i just text him? should i wait until i have my appointment may 10th?