Period after birth control cessation

Stefani

Hi! First post. I came off of hormonal birth control this past may (was on BC for a little over a year march 2017-may 2018). Didn't get a period until August 23 (5days in length so it was a pretty normal period for my standards) now I'm on CD 40 and no period in sight. I've taken test after test and none have been positive. I'm thinking it may be my body is still trying to self adjust after being on birth control, but at what point should I go talk to my OB? Or have you had similar experiences? My hubby and I want to start TTC this month and this absence of period is making it rather difficult to track ovulation. TIA!