$Blastocyst$ is formed from the cleavage of zygote which gets implanted on the uterus.

In human females,the blastocyst:

Which of the following is $NOT$ a characteristic of cleavage?

Which hormone helps in the journey of sperms towards the ampulla by causing contractions of the uterus and fallopian tube?

$A$: All copulations do not lead to fertilisation and pregnancy.
$R$: Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.

Cleavage is followed by which stage?