2 weeks after miscarriage

I found out I was pregnant May 6th. I started bleeding extremely heavy May 21st. I was like gushing out blood and clots, so I was for sure I was having a miscarriage. My hcg level was 10,893. I went to the dr May 23 and my hcg level that day was 2,993. My dr told me to take a test 2 weeks after the 23rd. I took it today and I was positive. Could it not be completely out of my system? Could I still be pregnant? Please help me