A week
How long ago was your MC? I have had the exact same thing happen to me
Just over 4 weeks ago
Also same thing happened to me when you test negative and you bleed just like a normal cycle sometimes when you take the wee sample a tiny bit of blood can mix in and it cause a false positives for me many times until my HCG was down to 0 that's when they was completely negative...I'm not sure why it happened when I explained it to the doctor she was baffled ,I showed her the tests and everything and chances are a little bit of misscarrige tissue/blood mixed with your wee sample and "contaminated" it ,leading to false positives
How long after you tested negative did you get your first positive?