So Frustrated! Please help me!

I just had a miscarriage on May 29th at 17wks 2days unexpectedly. However, I had a D&E performed as well. Fast forward to last week June 23-25, I had 3 positive pregnancy test! Two early result and one digital test. I went to the hospital on Saturday(4 days ago) and had negative urine and blood tests. Blood levels were at 7. Two different doctors told me that my hcg levels should have been back down to normal and that I shouldn't even be getting positive tests.   I took another clear blue digital today and it still says pregnant 1-2 weeks! The instructions says that the hcg levels need to be at least 25 to pick up a positive result. WHAT IS GOING ON? Am I pregnant or not?