Single mom and pregnant

I was with this guy for almost four years engaged and everything We had a baby last year in February2019. He left early January of this year and still hasn’t contacted me, he’s blocked me on everything, he doesn’t see his son and not even a week later after he left he had a new girlfriend and not even a month after we broke up their engaged. They live with his parents and his parents pay for everything. I’m heart broken and on top of that I’m carrying our second baby. He left twelve days before we were supposed to find out the gender. And now I’m scared and stressed and need advice. I’m so scared of what my family will say because I’m pregnant again. But when we were together I was more than happy to tell them! I don’t know what to do should I just move on?