We definitely store extra estrogen in our fat!! Losing fat releases extra estrogen, and gets things out of whack. Some have weird periods, some lose some hair. We have shocked our bodies by severely reducing carbs. And it should level off. If it doesn't some women have had success with NATRUAL progesterone cream, not the wild yam stuff. Here's a link for progesterone sources, http://www.johnleemd.com/resfornatpro.html

We talked about this extra estrogen a little on this thread, http://forum.lowcarber.org/showthread.php?t=126588 There are also threads on using progesterone cream.

Hope this helps.