Please comment.

Ashleigh
I started my last period August 15th to the 19th. I have 35-40 day cycles. Period never showed up in September. Now it's October 5th and still no period. I go to my OB tomorrow at 1:45. My test was BFN 2 days ago. I might have ovulated a tad late. What could I expect possibly? Anyone with a similar story who can help?