Hi. I'm going through the same thing. I didn't know I was pregnant until the second month. I'm 18 but i don't have any other family to take me in. I think your brother is being the most amazing brother and I think you should keep the baby if you can. In my case, I don't think I can...but if I figure out a way to have it...then I will.
Please keep me updated on whats going on. I need all the help I can get.