18 scared pregnant and how to tell a strict dad im moving out

I’m 18 years old and pretty much my whole life my dad wasnt really there not because he didn’t wanna be but he was truck driveing to support us because I have 4 brothers and sisters and I’m the baby but about a year ago he had to stop working because he had a heart attack and since hes been home hes been really strict on us all can’t go anywhere without asking him its basically a dominator type thing he feels like everything we do is wrong I guess but I know hes only doing it because he wants us to have a better life than he did and I feel terrible about it but I have been with my boyfriend for 2 years on the 11th and my dad knows nothing about him I think he expects it but I know hes not expecting me to be pregnant I feel like I have dissapointed them all I still live at home but my boyfriend is pushing me to move out and I completley understand that because he wants to be there during everything and I am happy with him and glad hes takeing it so well I just don’t know how to tell my dad because I know hes gonna be dissapointed and I know I’m just gonna have to tell him but just wondering if anyone could shed some light or let me know how to tell him I’m pregnant maybe not face to face because I don’t think I can handle the yelling and all that if anyone can help at all it would be aappricated because I feel like all this worrying is bad for my baby