No period for 2 months. Not pregnant

Heather

I havent had a period since December. Sounds awesome, except for the fact that I have no idea why.

2 negative HcG blood tests, all lab work & hormone levels are normal.

Dr says that there isnt anything explaining why. But that she wants to wait until I have missed 3 consecutively before doing anything else.

I'm just at a loss. What gives?!