Now, in this particular case, estrogen created a positive feedback loop, but in this case, it will create a negative feedback loop as shown in this diagram. So at this particular point and by the way, notice that Ovulation and the LH surge took place on the 14th day mark. So that means after about two weeks, ovulation will take place as a result of that LH surge. 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.