How do I tell my dad I'm pregnant again? (READ FULL BACKSTORY)

I'm a 19 year old married to a 20 year old. We have an 18 month old daughter, and we were out on our own until unfortunate circumstances happened due to the pandemic and my father (64yo) began leasing an apartment for us June 1st. He pays our full rent $825/mo. If you think I am spoiled to have him do that, please consider that A) It was due to a pandemic

B) My dad threw me out of the house long before the baby even happened. He disowned me when he was still legally required to care for me. We are on good terms now but he gave up on the parenting gig a few years early, so maybe it's good he made up for it a bit.

Although it was rough we are now financially stable again and I know we will be able to move out by the time the lease ends (March 1 2021). My fear is that my father won't believe we are capable of this, regardless of what I tell him, because to people his age it seems that "kids" with children are doomed to be financially ruined forever and also because we are both self employed as of July (one month after the lease began). To people his age it's not even like you're speaking the same language when you say youre self employed AND make enough. ******Despite my offers to help with rent****** he declined because the agreement was to help us for the whole 10 months because he didn't before. I'm now almost 5 weeks pregnant with #2. i wont tell them until at least after the 8 week ultrasound but i am so scared that my dad is just going to have a stroke or something because he will think this means we cannot move out by March and we are financially fucked forever, which isnt the case. How do you go about this?