In natural conception, day 2 to 3-day-old embryos are normally found in the fallopian tubes, not in the uterus. The embryo first moves into the uterus at about 80 hours after ovulation. The embryo implantation process begins about 3 days later – after blastocyst formation and hatching out of the embryonic shell (called the zona … Continue reading Blastocyst Transfer in IVF: Advantages, Disadvantages and What to Consider