How should I tell my father?

I’m sorry if this is the wrong group but I have no clue where to put this. I found out I was pregnant about 3-4 days ago.. I called my mother and told her and she’s so excited. But I’ve been running through my mind of when I should tell my father and how I should tell him (my parents are separated). My dad is very stern and can get easily angered about life situations. He always feels there’s always way better things in life to achieve no matter how successful we are. My father adores my boyfriend and already gave him his blessing without my boyfriend even asking.. we aren’t engaged yet and I’m only 20 and my boyfriend is 21. I’m not sure how my father will react. Should I do a cute gesture to maybe soften his possible reaction or should I just tell him? 🤷🏼‍♀️