Hi,
Welcome to health care magic,
As per your history and problem, it is most probably a post menstrual spotting which seems to be DUB i.e
DYSFUNCTIONAL UTERINE BLEEDING which occurs due to
hormonal imbalance.
If this is your first episode then no need to be worried for any further evaluation, but if this is repeat episodes I will suggest you to undergo few investigations i.e. scan pelvis (to see if there is any problem with uterus or ovaries),
thyroid function test (thyroid abnormalities can present with irregular bleeding) and
haemoglobin (to rule out anemia).
Chances of
pregnancy you have already ruled out by UPT at your home.
Generally treatment is recommended after investigation and I use combined OC pills for my patients with similar episodes.
In short, you can wait for a few days more and I expect the spotting to stop.
If symptoms persist or if the episodes recur subsequently, you are advised to seek medical attention.
Consult your gynecologist for further evaluation.
Regards,