Estrogen and Progesterone

What does high estrogen mean during <a href="https://glowing.com/glow-fertility-program">IVF</a>? I am in the middle of my <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle and my nurse called and said to decrease my medication because my estrogen was high and to start cetrotide? Also does progesterone decrease or increase when you are about to ovulate?