Bleeding

So I've been bleeding again for two months and some. Came out of hospital  another two round of transfusions. Still nothing to as why I'm bleeding after a while clean up surgery since Jan. Frustrated and upset about it all. Just getting estrogen. It's not helping with bleeding still!! My obgyn is referring me to a reproductive endocrinologist. Because I do want to conceive and she says it should help with my bleeding. I'm starting to worry what if it's not my uterus bleeding? No other test done but ultrasound and blood works!! So upset what do you guys think?