Urine hCG disappears at about the same rate as serum hCG, which can take anywhere from 9 to 35 days, with a median of 19 days. However, the time-frame for when an hCG result will be negative is dependent on what the hCG level was at the time of the miscarriage.More information is available at the link below.n March 11th, I had my first period after my miscarriage. It was a typical cycle for me-lasting 5 days. We decided to try again right away. My period is due tomorrow but I took an early pregnancy test on Monday and was a light positive.