Frozen embryo cycles is a fertility treatment that allows previously frozen embryos to be place in the womb via an IVF procedures. Frozen embryos, previously extracted as part of a standard IVF cycle are stores in a special freezing chamber until you are ready to try fertility treatments again or if you decide to conceive another child. FET thaws your remaining embryos and then implants them into your uterus. Frozen embryo treatment is a popular option for couples that have already undergone previous IVF procedures.