Thanks for your query.
you are experiencing post menstrual spotting.
This could be because of a missed pregnancy
, an ectopic pregnancy.
Stress, anxiety can cause this.
Thyroid hormone disorders or polycystic ovaries
also could be implicated.
or fibroids and ovarian cysts as well as endometriosis
are also likely differentials.
To know the exact cause, please consult your gynecologist and have appropriate blood tests / ultrasound