Single Mother

I know I'm not the only one who's been through a tough pregnancy. I really don't need anyone judging me. I just don't have friends that I feel are loyal to tell my story. My unborn child father and I been on and off a lot of times over the past years. He has other children with other woman and he claims all of them. I recently got in contact with his most recent baby momma off the strength of another person I called my friend. She was upset I was pregnant and I was telling me he told her he doesn't have a baby on the way. Finally when he calls me for jail cause he's incarcerated right now. He denies the baby to both of us. He told me and her my son isn't his. She then goes on Facebook and brags about the baby not being his and how happy she is until my cousin post her all the pictures of me and his conversations. He saying he loved me and when I wanted an abortion, he told me he don't condone in one. So here I am not almost 5 months pregnant and stressing out. I know stressing can lead harm to the baby when it can be born early. I really don't know what to do in this situation besides raise my son but I also have a daughter. Her father passed away two years ago. My family is judgmental because I come from a rich small family. But what is the best advice someone can give me? We've been through this before I believe I will receive a phone call about he's sorry. But this is something I can't look past. Would I be wrong if I tell him not to call me or contact me when he gets out looking for me and my son. Or if he tells me he just didn't want her to know and he knows that's his baby and wants to be in his life should I let him?