I had a miscarriage about a week and 2 days ago but i had unprotected sex on the 5th day. today i took pregnancy test it came back positive?

Below: Because today's pregnancy tests usually detect even very low levels of hCG, taking a pregnancy test in the days or immediate weeks after your miscarriage can still show a positive result. You may also continue to feel pregnancy symptoms, even when it's 100 percent certain that you have miscarried. It takes an average of 19 days for hCG to disappear from the body, but this can vary based on how high your hCG level was at the time of your miscarriage. It can take around a week to return to zero with a chemical pregnancy (a very early pregnancy loss) or over a month with a later loss.