Late?!

Stacy • Married 9-6-14!! Have an amazing 6 year old boy and a 1.5 year old girl!
I got a uti at the beginning of my fertile week last month which turned into a kidney infection so obviously we didn't bd that week and I couldn't pinpoint what day I O'd because of everything and the meds, but glow said Saturday and it's usually right. I have a 31 day cycle and I'm never late. I was supposed to start on the 10th and I still haven't. I marked that my period was late on the 10th and it moved it back to the 12th. I'm really conflicted on what to do. Here is my calendar. 

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