When did ovulation happen?? Pics included

Brittany • 20....married since 7.16.14. TTC #1.
Hello everyone,
​ I used OPKs but I'm not familiar with them quite yet. Pics date left to right (9.15.14-9.16.14-9.17.14-9.19.14) today I am cramping on my left side lower abdomen. 

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