When should I tell my dad?

Alright so my dad.. well he really hasn't been in my life for the last 5 years. I think there's been a few times where I called him on the phone just to check-in and see how he's doing and then maybe three times that I'd seen him. I should mention I'm the only one making the effort...

Growing up my mom had primary custody of me but I would go see my dad every other weekend. me and my dad were never really close and I felt like it was a chore to him to spend time with me..

Well I'm going on 13 weeks pregnant now and going to find out the gender soon due to nipt and I'm wondering when or if I should even really tell him..

We had about a 30-minute phone call on Christmas day.. he seemed pretty Interested in knowing how my life had been and what I was up to .. I felt like telling him then but I figured against it..

I know eventually he's gonna find out obviously.. I just don't know if I should tell him or let him find out on his own.. he lives an hour and a half ish away so telling him in person would be an option.. ugh I just need some advice