Positive test

Patient: I had a very light period last month, I took a clear blue digital pregnancy test two days ago in the morning and it read positive, since then I have taken two others of a different kind, they have read negiative. I am a little concerend about this seing as I have a 5 yr old already and lost a baby 3 yrs ago. What test should I trust? could the positive result have been wrong? I know I should go to a OBGYN but my car isn’t running and I do not have a way to get anywhere. Nor do I have insurance. I can’t sleep at all due to worring. Just thought that I would ask a professional