Join Date: Jul 2002
Location: standing in a doorway
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Here's what it says in TCOYF:
Follicle Stimulating Hormone - eggs start maturing, follicles produce estrogen
Estrogen - estrogen makes the endometrium grow. once estrogen is high enough, triggers abrupt LH surge
Lutenizing Hormone (LH surge) - causes the egg to burst through the ovarian wall
Ovulation - follicle then becomes corpus luteum which releases progesterone
Progesterone - progesterone sustains the lining but the corpus luteum deteriorates at a certain point (Luteal phase) and the cycle starts over again
In anov cycles, either a drop in estrogen triggers menstruation or the estrogen keeps building the endometrium to a point where it can't support itself sufficiently and bleeding occurs.
So to answer your question, the lining is built up before ovulation, when and if you are going to ovulate, whether you are having a regular cycle or not. The difference is what triggers the lining to shed, but your body still has to get rid of that old blood before a new cycle can start. That's why docs prescribe progesterone to kick-start af and a new cycle.