Discontinuation of the contraceptive disc. I used the disc ginoring ...

Discontinuation of the contraceptive disc. I used the ginoring ring for 4 months, on October 7 I took out the last one (there was withdrawal bleeding) and I did not apply another one. From the moment I put in the last disc, I was not sexually active. I'm 19 years old, I didn't have any side effects, it's December 3, I still didn't get my first period. Is this a reason for not peace? When to wait for menstruation? What to do if it does not occur? And does its absence mean a permanent loss of fertility caused by the disc?