Thanks for writing in.
I think you can wait for few more days. If no bleed then you should go through some other tests to judge your ovarian function. At least you should check your hormone levels ( FSH & LH respectively ). There are many other tests that need to be done like Prolactin
( these are also hormoses). All these along with your history & clinical examination findings will help reach the diagnosis.
So, go back to your doctor & discuss this issue as your endometrial thickness is not favourable to expect a period.
Wish you good health.