Hi V_ni
I don't know if you made a typo or not, you said your FSH was 12 before, and now it is 6, this is a fantastic result! The lower the number, the better the reading. The higher the number, it means your body is working harder to stimulate.
The doctors are happy to see anything below 10 for women in the late 30s. I don't know how old are you, but 6 is a very good reading. I made only 2 eggs during my 1st IVF and failed that attempt. I will be planning to go for my 2nd cycle in a couple of months time.
By the way, I have a friend who swear never to try IUI, she thought was a waste of money. She got pregnant twice with IVF.
Maple Babies
Yes, Estradiol reading also indicate our body's stimulation ability. I dont exactly know what they meant, but if you have a good reading for FSH but a abnormal estradiol level, that affects the overall result too. Here is a link that tells you abit more, I thought this link explain very well in layman's term.
http://www.advancedfertility.com/day3fsh.htm
Rabbit
Were you successful on the cycle where you made 3 eggs?
WB
My doc say if our ovaries are "done" working hard, no matter how much doses we put in, they won't work. But yes, you are right, have to try higher doses so we weren't walk away wondering "what ifs".