So I just found out I'm pregnant about 1 week ago, I currently have 4 kids

So I just found out I'm pregnant about 1 week ago, I currently have 4 kids. Me myself I'm happy about my pregnancy but my boyfriend isn't. He says that he can't afford another child, and don't get me wrong.. I know we can't afford another child but I know we will make it and we will be okay. I wish I had more support from him, it's been a really tough decision to keep my baby or not to keep it. I have an abortion set up for next week but I still really don't know what's the right choice. Any suggestions please