Hormones and periods and babblings, oh my

Took my last progesterone pill for the month at around 11:30...my period started just a few hours later. It seems pretty sudden. I hope that's a good sign, that something is happening. It could just be my body getting used to the dose, or something. I took the progesterone a day early last month, because I was about to run out of estrogen, and my period didn't start until the 21st. Like my body was expecting that to be the end of the progesterone. (Typically the progesterone ends on the 20th, like today.) Who knows...I certainly don't have the knowledge to decipher whether or not this means anything.