Norethindrone
"I've been on this pill for almost two years and it has been great. No weight change. My breasts got really sore at first and gained a cup size, but that normalized. I did feel like I lost a lot of hair and my acne flares up once in awhile, but drinking a lot of water helps the acne. My period was twice a month at first, but now it is every six weeks and it lasts seven or eight days.  Kind of strange, but I've gotten used to it.  My favorite part of this pill is that I haven't experienced pms that my husband nor I can remember. We used to get in monthly fights... I highly recommend this pill for someone that doesn't want to take estrogen. My mom has blood clotting issues, so this was one of the only options for me."