Conjugated estrogens
"I started an abnormal cycle after a year of not having one. At first my cycle had came back on with a vengence and then it went to just spotting.  I thought yes it's about over but the spotting did not stop. It was well over a month so a co-worker introduced me to estrogen conjugated tablets. I started taking them for my hot flashes but little did I know that they would also stop the irregular vaginal spotting. But it took a week for it to get in my system and work."