What causes late periods but negative pregnancy tests?

Can you post private, please? My period normally comes on the 3rd of every month. I was supposed to start fertility pills this month as my doctor said that I have cystic ovaries or something and that my progesterone levels are low. I never got my period, so I couldn’t start the pills. I’m 14 days late. Still no period or sign of and taken like four pregnancy tests all came back negative. Any advice? Should I call my doctor?