I was just prescribed progesterone to take at night after ovulation until AF or BFP.

I use opks and I have had positive opks for the past 2 days. Today it started to fade and the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says that’s means I’m about to ovulate....should I start taking the progesterone pills tonight or wait till tomorrow?