Everyone is different! And it depends on how high your HCG levels got.
It typically takes 6 weeks for the HCG to reach 0. First Response can pickup HCG levels as low as 12-13 MIU.
It took me 8 weeks to get a period after my miscarriages.
If I was only 5 weeks along, how long would it take my hcg levels to go all the way down so that pregnancy tests would be accurate? It been almost 40 days since my miscarriage, shouldn't my period have come along by now?
You are definitely most likely still picking up HCG from the previous pregnancy. The early tests that you can take at home are a LOT more sensitive than the ones in the doctor's office. She should've done a quantative HCG test, not a urine test, to make sure your levels were returning to 0. Your levels could be upwards of 100 and their tests in the office wouldn't pick it up.