Pregnant before period arrives following miscarriage

Hanna

Ladies I need some advice.

I had a missed miscarriage around 21st December. Had a negative pregnancy test which confirmed hormone levels had reduced and miscarriage was complete. Had unprotected sex three weeks after miscarriage. Took a pregnancy test this morning and it is positive! Is it possible I am pregnant again? Or our my hormone levels still high?! I have not had a period after the miscarriage and didn’t think I would have ovulated. What do you think?