Hi, Welcome to Health care magic forum.
Don't worry it is common for some people to have abscence of periods after stopping the pills, any how you had H.P.T negative.
The other causes may be the anemia
, or infection.
I advise you to consult your doctor for diagnosis and teatment.
Take more of green leafy vegetables, pulses, sprouts,and
protein rich foods to hasten the recovery.
Wishing for a quick and complete recovery. Thank you.