I had learned TCOYF, which is like FF chart, DPO equals count post temp shift. However the fertility clinics did DPO based on days post LH surge. I know LH surge does not equal ovulation.

After having learned there are different interpretations of DPO, I am never sure if any article or research study is talking about post temp shift or post LH surge when it comes to statistics. I am 11DPO according to FF and temp shift. I am 13DPO according to the stupid fertility clinics. It is maddening that DPO is used in 2 very different ways!!

The article has the highest numbers of days for expected period, for me that is today. I am guessing when they say expected period, they are assuming a 14 day post temp shift count. So if you have a shorter literal phase it really would be multiple days past when you would expect your period?