DAY 2 DAY 1 First DAY 3-4 Cleavage 2-cell stage 8-cell DAY 4 4-cell uncompacted Fertilized stage morula 8-cell Egg compacted (zygote) morula DAY 0 DAY 5 Ovary Early blastocyst DAY 6-7 Qvulatio Late-stage Oocyte blastocyst (hatching) DAY 8-9 Implantation of the blastocyst