So let's go back to this section here. So what happens as progesterone increases? Well, as progesterone increases, it causes a negative feedback loop on GnRH. And at this particular point, our estrogen will now create also a negative feedback loop. So estrogen is interesting because it not only creates a positive feedback loop in this area, but it also creates a negative feedback loop in this section here. So at this point we see that estrogen and progesterone create a negative feedback loop and decrease the amount of GnRH that is released.