When should I start taking my progesterone? (Read description please!)

My obgyn put me on oral progesterone supplements to help with my long and heavy periods (not to help conceive). She told me to start the pills on CD 14 through CD 28.

But now that I am TTC, according to OPKs, I’ve been getting my LH surges either CD 14-15 or CD 15-16, which means I’m not ovulating until CD 16 or 17. I am wondering if taking the progesterone starting on CD14 (before ovulation) is interfering with my ovulation?

Or, since I AM getting an LH surge, does that mean it isn’t interfering? (I am tracking bbt for the first time this month so I don’t have that data yet.)

What should I do? Continue to take it CD14? Or wait until after I ovulate?