My dad- sorry this is kinda long

Jamie • Married to my soulmate since 2013! Pregnant with #3
So my husband and I are expecting our third child. We couldn't be happier. It was completely planned. I am 5 weeks and 3 days, so it's still early which means we are waiting to announce it to everyone. I have my first appointment in October when I am 8 weeks. I will tell my two best friends after just because I know they will support me regardless of what happens, but we are waiting until after the first trimester to tell EVERYONE. I do not come from a very supportive loving family. My mom passed 7 years ago, who I miss every day, and my dad has been married to the wicked witch of the west for 16 years.  I love my dad, he's a great man, but isn't allowed to really be there for me because of her😒. I want to tell my dad that we are expecting, I mean, he's my freaking dad!!! But she will be just mean about it. Roll her eyes make bitchy comments and whatever else she decides to do to make it known that she hates me. Being pregnant, I can't handle it. I am emotional. I told my grandmother that I wasn't going to tell him, because of that. She told me I need to tell him. Or he'll be upset, but I don't know if I really care if he's mad. It's not like I have hella baby daddies and I'm 19 and livin off people and can't afford my kids. Ugh I'm rambling I just don't know what I should do. What y'all do? Am I wrong? Should I tell him or say eff it? He'll find out when he sees me next.