Norethindrone
"I started taking this when I was breastfeeding. My milk production decreased, but I don't believe it's linked to the birth control. Now that I'm no longer breastfeeding, my period is lighter than normal and I have random spotting. It isn't much at all though, so I really don't have complaints. I have yet to become pregnant again (thank the lord), and I haven't had any major issue so I like this medication."