Help! Unknown ovulation, bbt chart

I am part way through my cycle and cannot figure out if iv ovulate or am about to ovulate. None of my opk sticks are positive and I am testing twice daily. I had lots of signs leading up to day 13 (wet mucous, high sex drive) but my temperature has only risen a little. My temperatures at the start were the same temperatures I was getting after ovulation last month, so really high. Makes me so confused! Please have a look at my chart and tell me what you think.

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