Norethindrone
"I started taking this pill after I had my son and am currently on month 4 of taking it. As soon as I started taking it I began to have intense mood swings, and was constantly emotional. My poor hubby had to deal with a crazy me.  The mood swings does down after about a month or so on the pill, but I have also had multiple periods a month, with only 7 days in between. This pill has been a nightmare! Since I have stopped breastfeeding, I am going to look into other options."