In order to perform CCS, it is necessary for embryos to reach blastocyst stage. However, embryos may sometimes take longer to reach that stage. In such cases, embryos are cultured an extra day to give them another chance to reach it. If they do, biopsy is

No. Fertility is not affected by having undergone an ovarian stimulation cycle for egg vitrification. When they maintain good fertility conditions, ovaries have enough ovarian reserve.