OPK + or - ?

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I have been going to the doctor to get ultrasounds to measure the follicle size. Yesterday when I went the largest follicle was 14mm. Can a follicle mature that quickly that this morning I would have an LH surge, or is the test wrong? 
The doctor was predicting that I would have my surge until Friday b/c when he checked the follicle size last Tuesday it was only 11mm that's the only reason for my concern.
What do you all see? Does it look positive to you? 

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