New pregnancy or HCG lingering?

La

I miscarried on 10/21 and had a D&C. My doctor didn’t trace my levels back down. About two weeks ago I took a cheap test and it was still faint. I told my doctor and she told me to test again in a week and If it’s positive then come back in. I tested a little over a week ago on a Walmart cheapie and it was negative or a vvfl (couldn’t tell but about 10 mins in it had a fl but you’re not supposed to read the test after three mins). 5 days ago I took a clear blue blue die and it was neg. Today I took a FRER and it was positive, not a blazing positive but a faint positive. Not sure if the other tests were just not sensitive enough and and the FR was? Problem is I’m away from my doctor and in the middle of changing insurance right now so I can’t go to the doctor got about a month. I have another FRER and I’ll take it in a few days to see if it’s any darker but just a little worried. Any thoughts?