Negative tests and still no period

Stephanie

Hello ladies, this is my first time posting. I am 40 year old and TTC for the first time. I am mostly regular and vary from 25-26 day cycles. I am on CD 36 and testing negative on one test and another test had no results at all. Any ideas on what I could be facing? I have reached out to my OB/GYN for an appointment, but would appreciate any tips.