The epi-no sits in the vagina, only about 2-3 cm. inside. It has no contact with the uterus or the cervix. I suggest you do another ultrasound at 36 weeks. If the placenta is still not placenta previa, there is no reason why you can't use the epi-no, but I would take extra caution and be sure to not put the entire balloon in, only 1/3. In that case, there is no way it could cause any bleeding at all or involvement with the placenta.