Feel free to share your thoughts

I had taken 2 first response pregnancy tests that came back as positive. I went to the doctor and his test was negative, twice. I came back home that day took a test, same brand and it was positive but the line was getting lighter. Next morning I tested and the line was barely there. What prompted me to test was I started spotting 4 days before AF then started bleeding. HCG level at 2. Any idea what could’ve happened 😔 waiting to see my doc again.