Cryopreservation might be performed as oocyte cryopreservation ahead of fertilisation, or as embryo cryopreservation after fertilisation. Through early blastocyst enhancement, fluid begins to fill embryo. The embryo begins to grow just like a balloon. To implant, the embryo ought to escape in the shell surrounding it. This is termed "hatching." https://bookmarklinking.com/story4323199/how-assisted-reproductive-technology-can-save-you-time-stress-and-money