Four months and no period

I haven't had my period for four months now and there seems to be no reason behind it. I'm not pregnant, have been checked for pcos and thyroid issues and have come back clean. Idk what this could be! I'm 21 so it should be regular. Any ideas?

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors