Missed period after misscarriage

I had a misscarriage at 5 weeks in June. I had a normal period the following cycle July , but so far this month Im now 5 days late and have missed my period completely. I’ve taken pregnancy test and they are all clear negatives.

Has this happens to anyone else after a misscarriage?

I’m making an appointment with a obgyn but thought I’d reach out in the meantime.