What does this mean?

Erica
I'm on CD 37, I had a positive opk on 2/9, no AF and BFNs. 
I'm 33 and ttc first child. Been trying since October.  Average cycle length is 27 days. 
Am I just really late for no reason? Been off birth control since last July so I've been pretty regular since then. I'm stumped!
Going to call doc if no AF by Wednesday.   Any thoughts?

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