Hey there,
I understand that you don't have money for prenatal care but there might be domestic violence victim shelters or rape victim shelters that help people who are in your position. I do not know your county but I can look for some resources to get you started and hopefully you will go there and get the support you need. I will come back to edit and add resource websites
Edit:
http://www.sunrisepasco.org/services.html
http://www.facelife.org/rguide.htm
http://www.safetampabay.org/domesticviolence.html
I think these sites is a good place to start. You can also try hotlines of rape and sexual abuse victims, they may be able to help you more tailored to your location and specific needs. Please don't lose hope, you can give the child for adoption. You can get through the pregnancy. There are people who will support you even if family won't. I know it is hard right now but please try to get assistance before. You will never know if you never try.