I have been reading online for the last 30 minutes and all I could think of was wanting to share this information with the ladies of the forum here.
:-)
I plan to buy this book but you can read quite a bit of it on the website and I am learning a lot about hormones and the menstrual cycle. It's hard to believe we aren't required to learn this stuff!
Here's the link for anyone who wants to know more about their body and cycle:
http://books.google.com/books?id=4oiL-eAIWRcC&printsec=frontcover&source=gbs_summary_r&cad=0
It's called Women, Hormones and the Menstrual Cycle, by Ruth Trickey.