How will gyno know what my luteal phase is?

2nd half of cycle. The menstrual cycle is divided into four sections. In order, the follicular, ovulatory, luteal, and menstrual phases. At ovulation, approx. Day 14-15, the egg leaves the follicle . The luteal phase follows and typically lasts 14 days - the last 14 days before menses starts. Looking at a temp. Chart, or testing with an ovulation kit are two ways to infer the luteal phase.