My only advice would be get stable on your own, in case things don't change, and get a paternity test once the baby is born, and get child support of he doesn't change his mind by then. Because he's just as responsible for this child as he is his existing child.
I know he has something to do with it definitely because he is the only person who knows I slept with the new guy when we agreed to try again everything was fine then I popped up pregnant my child's father is like anti condom & pull out method with me -_- and this is our second child conceived and the first one I aborted bc he made me so stressed but only to wind up pregnant a few months later , in his head I got an abortion one week and was pregnant the next but he's just trying to save his own *** because his child's mother is a obsessive b*tch who stalks my social media
Its probably your ex calling saying that to him cause he's jealous