There was no significantly different outcome of pregnancy among 442 patients who became pregnant following cessation of the use of oral contraceptives, when compared to the pregnancies of a similar series of 699 patients who had employed other contraceptive measures. An ancillary observation noted that 608 (53%) of the total of 1141 gravidas had not planned to become pregnant; yet, three-fourths of them had not employed any form of conception control.