I had a miscarriage late Dec (30th) and exactly 4 weeks later today I am getting a positive hpt. I have taken one on the 21st of Jan and then another on the 29th which hasn't really changed. I miscarried at 6 weeks but it took another 3 weeks for body to realize and miscarry. I know it could take up to 6 weeks to be negative but this is torture :'(