help please :(

I’m 18 years old, and 31 weeks pregnant and I don’t know how to tell my dad I’m pregnant. My boyfriend keeps arguing with me about it but me and my dad have a bad relationship. The last time I seen him was October 2020 and that’s when he physically assaulted me. My dad texts me and all that but I barely reply. I don’t know if he knows I am pregnant yet, I assume he knows by other people but I just can’t get myself to tell him. My mom and my boyfriends mom tells me I’m not obligated to tell him because of what he did to me when he was blacked out drunk 🤷‍♀️ but I feel like he’s gonna find out about the baby eventually, like what am I gonna do? Pop out with a baby?? I’m so lost right now that it’s been bothering me. Just to clarify I haven’t physically seen him since October 2020 but He messages me about random stuff because he thinks everyone will just forgive him. 🙄