PLEASE HELP!!! I need answers.

Alexis

Last month I had a positive pregnancy test. A week later my hcg levels dropped to 60 and the dr said my uterus was empty and I was having a chemical pregnancy to expect a regular like flow which would be a miscarriage. I got a regular like flow august 10-15. Today my hcg tested at 65 again. My dr want to wait and re test next week. Has anyone else experienced this??? When can we try again. What is going on why is hcg up and down?