Hi and thanks for the query,
The commonest cause of abnormal bleeding usually deserves a careful exclusion of a pregnancy
or ectopic pregnancies. Beta HCG
measurement, abdominal ultrasound
to check for fibroids or any lesion in the uterus
would be useful.
It is however not rare to for girls between the girls of 18 to 25 to experience such disturbances. Stress could be an aggravating factor. The opinion of a gynecologist could be very useful. Kind regards