The likelihood of an ectopic pregnancy occurring with an IVF fresh embryo transfer is extremely low, and the occurrence of an ectopic pregnancy is not directly related to the number of embryos transferred. An IVF transfer involves placing a transferable embryo into the uterine cavity and waiting for the embryo to attach itself to the uterus and develop into a fetus. Normally, the embryos are placed at a distance from the bottom of the uterine cavity and travel around the uterine cavity in search of suitable endometrial implants. If the endometrial lining is not well tolerated or endometritis occurs, the embryo may be impeded from implanting, the embryo may move toward the opening of the fallopian tube in the uterine cavity, and may implant in the fallopian tube or uterine horn and form an ectopic pregnancy. The occurrence of ectopic pregnancy is not directly related to the number of embryos transferred. The probability of ectopic pregnancy is also very small with the transfer of 2 fresh embryos.