In America today, what percentage of American women conceice child while on birth control?

The women in question have been prescribed some kind of birth preventing drug by medical professionals.
The women were prescribed drug long enough ago so that their bodies have become totally effected by the drug.

Taken correctly, the birth control pill is 99.9% effective.

By "taken correctly," i mean taken every single day at the exact same time.

The person above me said "The women were prescribed drug long enough ago so that their bodies have become totally effected by the drug." THIS IS NOT CORRECT. As soon as 1 month after stopping the pill, you become as fertile and able to conceive as you were before taking the pill. Think about it: would there really be a drug out there that millions of women take that destroys their chances of having children? I don't think so.