Hello there.
I can understand your concern, i want to know if your periods have always been regular?
are you sexually active?
firstly, if you have been sexually active , kindly do a urine
pregnancy test at home to rule out pregnancy.
if not then no need to wait, consult a gynaecologist and get a ultrasound abdomen and pelvis done.
you need to work on losing weight also,
dont delay any further.
best regards,
Dr. Anil Kumar jain