Hcg after loss

Rachel

My hcg never rose past 2900 at 5 weeks. That was December 20th. I went to my doctor and was told I had a complete miscarriage on Jan 7th. My uterus was back to normal. Now tonight I have a very positive test. Could it be? Or is it just still hcg left behind from my miscarriage? I’m so confused. Please help.