It does sound like an early miscarriage to me. I had one confirmed miscarriage and a couple other "suspected" miscarriages. If you have bled heavily and your tests are now negative, that's most likely what happened. I'm so sorry. I know how tough that is to go through. But just remember that it's nothing YOU did, it just means the pregnancy wasn't viable. Lots of love!
Let me know if you have further questions I have had a miscarriage myself
From the second your body concieves you produce the pregnancy hormone HCG which is what makes the home pregnancy tests positive. If the pregnancy is viable they will continue to double every few days to support the pregnancy. If the pregnancy is not viable the levels will fall and eventually not be present in your body anymore.