Baby Daddy

What happens when you don't know who the baby daddy is? Well I recently found out that I am pregnant. My boyfriend is pretty calm about it, but I'm not sure he's the baby daddy. It might be my ex boyfriend Harry Styles. I don't want him telling Niall that he's the real baby daddy. I don't want him to be. I hate Harry I feel nothing for him anymore. I'm scared if Niall finds out he'll leave me. I can't be left alone, my parents through me out I'll be screwed. Is Harry planning on telling Niall? Will Niall leave me?