Progesterone questions! When did you start after positive opk?

When did you start taking progesterone after your peak opk? I’ve read different things! My doc said to start on cd 17 assuming I’d ovulate on CD 14... but that’s where I’m confusing myself.. Would this assume that you had gotten a peak on CD 12? And ovulated on CD 14 and then started progesterone on cd 17? Or would this assume you got your peak on CD 14 and O’ed around CD 16?

Since I’m Not yet O’ing (cd 14) I’m assuming this must need to be pushed out as I haven’t reached a peak.

Just curious what you guys all did and were told to do??