TMI.... Testing out HCG After miscarriage. It's been 5 weeks

I was 7 weeks and 2 days when I miscarried on Feb 1, I had 3 betas done. My last one the level was at 21. That was 2 and a half weeks ago. I am still getting positive pregnancy test. I guess I want to know others experience with getting positive test 5 or more weeks after they have miscarried. I can't get another blood test I'm moving out of the country. I hate being in the limbo I just want a damn negative so I no I'm good. Now we haven't been careful so testing is driving crazy at the moment. I got a dark positive 3 days ago and when I test today it's back to being faint. What is your experience with testing out HCG