does it mean im not

Ovulating if I don't get positive opks? I'm currently awaiting to have blood tests from the doctors but need to catch it on the next cycle, so I thought I'd try opks so I can give them more info. 
Tomorrow is meant to be my most fertile day and the test was completely negative -and I'm not getting my usual cm. 
Can your ovulation symptoms change? Can you be ovulating even though the opk is neg? Xx

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