On my last ultrasound it showed that I had a thin uterine lining and a lot of fluid, probably from a recently burst cyst. I was also told I had extremely small ovaries. It seems to me that endometriosis since it's estrogen dominant, would cause a thick lining not a thin one. Is that correct or could it be adhesions and cysts that are causing a thinning? I also bleed every 21 days so it seems like that would cause thinning too.