Why has it been recommended to wait 3 months after stopping the oral contraceptive to try conceiving a pregnancy?
It may take a few cycles off the oral contraceptive before returning to regular cycles (ovulating once per month). Thus, for the purposes of calculating how far along a woman is in her pregnancy, it may be beneficial to wait until her cycles return to normal prior to conceiving. The oral contraceptive pill is however not teratogenic; that means that no ill-effects have been found in fetuses inadvertently exposed to the birth control pill, nor to babies conceived shortly after a woman has stopped using the oral contraceptive.