Cramps/back pain but negative OPK

Cortney • Army wife. Wrestling mom. Dog lover to a boxer.
For the past two days I have been having cramps and lower back pain, super moody and emotional. 
My period ended on the 28th which was a week early, I normally have a 36 day cycle.  All my opk tests are way lighter that the control line --- is this ovulation or what could it be?? 

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