Sorry I'll just quickly butt in......but endo generally reacts in the same manner as the endometrium in your uterus. So if you are stimming with E2 which thickens the blood lining in your uterus then endo MAY be stimulated to - but not always. Clomid turns off the pituitary gland so that when you stop taking clomid the gland responds by over-reacting in the follicular phase, which can mean increased E2 levels - but not always.