Hi, Welcome to Health care magic forum.
If harmone medicines are frequently used, it may cause the irregularities of the periods,and hence the doubt of pregnancy
Other causes of irregular periods
may be the anemia
, or infection.
I advise you to consult a gynecologist for diagnosis and treatment. She may need to have MRI
for diagnosis .
Ask her to take more of green leafy vegetables, pulses, sprouts,and protein rich foods to avoid such things.
Wishing for a quick and complete recovery. Thank you.