My daughter-in-law has hypothyroidism (so do I) and got it about the time she was pregnant; it's often common with pregnancy and doesn't have to be permanent. I would go to your doctor and get it checked out so you can get it off your list of things to be worried about.

"One in every 20 women will develop hypothyroidism after pregnancy. This happens because they developed antibodies to their own thyroid prior to the pregnancy, and this caused an inflammation of the thyroid after delivery. This condition most often develops between four months to a year after delivery and usually resolves on its own. If it is long lasting or permanent, it is easily treated with medication." From: http://www.ehealthmd.com/library/hyp...pregnancy.html