rising hcg after miscarrage

Hi ladies I was wonder if anyone had had a miscarriage and had rising hcg levels afterwards and if it has resolved itself. I have been checked for etopic pregnany and they can not seem to find anything but my levels are slowly creeping up and up but not enough to be pregnant. I wanted to know if anyone else has experienced this and when you have done to help your ur levels return to normal and how long it took roughly as I'm not allowed to go back on contraception untill the are back under 4. Any advise would be greatly appreciated.
Thank you