Guessing and misinformation about pregnancy risk among urban mothers.

Only one-third of urban mothers interviewed twice, a year apart, answered correctly both times about when during the menstrual cycle a woman is most likely to become pregnant. Classroom discussions about contraception, attendance at family planning clinics, and discussions with one's mother about contraception are not positively associated with knowledge about pregnancy risk. Those using methods other than the pill or IUD are more knowledgeable about pregnancy risk--perhaps because they have a greater need to know.