The purpose of this study was to analyzed fertility intentions, behaviors, and pregnancies among 296 heterosexual couples participating in the Creighton model effectiveness, intentions, behaviors assessment (CEIBA) study. Couples who were new or returning users of the Creighton Model (CrM) with the intention to avoid pregnancy (at entry) at 17 Creighton Model Fertility Care Centers throughout the United States and in Toronto, Canada were enrolled in the study. Females were required to be between the ages of 18 and 39, inclusively, and the couple could not have any identified history, circumstance, or current treatment that would reduce fertility. Written informed consent was obtained from both partners.