After 5 to 6 days of fertilization, the embryo is known as a blastocyst.
Day 0- is the day of egg pickup and sperm are either placed around the eggs (IVF) or are injected into the eggs (ICSI).
Day 1- The egg is fertilized by the sperm.
Day 3- The embryo has about 6 to 8 cells.
Day 5 or 6- It is now in a stage called blastocyst which comprises of a fluid-filled cavity (blastocoel), an outer layer of cells (trophectoderm which later forms placenta) and inner cell mass (ICM) which later develops into a fetus.
Increased chance of cycle cancellation especially in poor ovarian reserve patients due to lack of availability of an embryo in blastocyst stage.
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