I am Dr Mbong.
Lots of things other than pregnancy
can be the cause of a reduced and irregular menstrual. Your age also determines the most likely cause.
If you are 40 or more, it may be an onset of menopause
. Some medications, stress, anxiety and strenous physical activity can also cause that. Contraceptive
pills can also have this as side effect.
Pelvic problems like an overian cyst, an infection or endometriosis
can also be a cause.
Please see a physician for investigation and proper management.