Hello, welcome to HCM, I am Dr. Das
Look, the negative pregnancy
test result indicates absence of pregnancy.
So, you have some other problem. Most probably you are suffering from polycystic ovarian syndrome
For confirmation, you have to do a n ultrasound
scan of whole abdomen. It will detect any abnormality in your overies or uterus
After that you have to be treated for that. Progesterone
challenge is the way to get the period.