Positive tests followed by negative tests?

Katelyn

I took a few first response tests around the 19th of September, which all were faint positives. I retested again a few days later with a different brand and the line test came back positive, but the digital said "not pregnant" followed with more negative tests after that. I went to the obygn today and my urine came back negative as well as a blood test. I'm not sure what to think other than it might be a miscarriage but I dont have cramping or bleeding and still have not gotten my period, my last one started august 14th. Any words of encouragement or advice please? 😟