Is it possible to get pregnant a week after a miscarriage?

Highly unlikely: It is common that the pregnancy test will remain positive for a couple of weeks as the hormone levels decline, so if your test is still +, it is most likely for this reason. Hopefully, you consulted a health care provider to verify what has occurred. Threatened miscarriage, incomplete miscarriage, and more importantly, ectopic pregnancy, can have similar symptoms and the preg test will stay +.