TTC on progesterone

Bria

This is my first cycle taking progesterone. I was told by my doctor to take progesterone on Cd14 until my period starts. I took progesterone today (CD 15) my LH test was lowering. Then after the progesterone I get a blazing positive LH test. Anyone else on progesterone have this happen?

When is the best time to take progesterone?