Welcome to HCM.
You have not mentioned whether you are married or single.
If unmarried you do not have to take registerone, to invite menses to occur. Let it come when ever it wants to.
I presume it is not primary amenorrhoea but secondary amenorrhoea.
Primary amenorrhoea requires detailed investigation.
If you are really concerned, you may consult a gynecologist and get an ultrasound
scan done to exclude polycystic ovaries