Fertility patterns after discontinuation of use of oral contraceptives

Investigation of the fertility-rate after discontinuation of use of oral contraceptives shows that the monthly rate consistently follows an oscillatory pattern. This pattern appears to be unique to women who have discontinued the use of oral contraceptives. It may result from synchronisation of a previously unrecognised natural cycle, rebound changes in the reproductive system following steroidal contraception, or an infertile period associated with early intrauterine mortality.