Irani M, et al. - A retrospective cohort study is done to compare the ectopic pregnancy (EP) rate between fresh and frozen cycles and between day 3 and day 5 transfers. The outcome of this study suggests that the day 5 frozen-thawed embryo transfer (FET) is related to a lower EP rate compared to day 3 and day 5 fresh embryo transfer cycles in patients undergoing IVF. Additionally, the transfer of a higher number of embryos is related to greater incidence of EP.