I Have Taken Six Home Pregnancy Tests And They Have

I have taken six home pregnancy tests and they have came out faint positive. Then I went to the doctor and I took a pre test for them and it was negative then they did a blood test and it was negitive. I still think that I am pregnant. I don't have insurance so how else can I try to find out if pregnant? Also can I be pregnant with a doctors negatively pee and blood test?