progesterone insufficiency
"I am on 100mg dose, days 14-28 of my period or the first 12 weeks of pregnancy.  The first month was great, I felt level, the only side effects felt were extreme sugar cravings and vivid, bizarre dreams.  However, in month two, no cravings, extreme mood swings and ranging from a need for a lot of sleep, not wanting to get out of bed to anxiety and very little sleep.  No pregnancy yet."