Possible late O

*sigh* so never in my life has my period been late. The one cycle that I decided to take it easy with tracking every detail and go for the "stop trying it happen method" my period is late and I have no idea why.....I got back to bbt right at the end of my fertile week (I had many days in a row that I wasn't able to temp due to working double shifts). Glow orig said my af would arrive on the 10th which would line up exact with previous cycles...here it is the 13th and nothing no signs of af or pregnancy. Neg tests even today with fmu...I am just so bummed I went with the care free way this Cycle because now I feel lost.....glow says I'm 13 dpo (after me logging missed period 2 times now) I think I'm only 12 dpo and it will arrive Thurs.....sorry just needed to vent anyone else in the same boat? First pic is what glows data shows second pic is what I think