Fsh Pregnancy How Menstruation Is Prevented During Pregnancy? Explain The Role Of Hormones.?

How menstruation is prevented during pregnancy? Explain the role of hormones.? - fsh pregnancy

I know that many of its hormones such as LH, FSH, estrogen, progesterone, during pregnancy are involved, etc., but I can not understand what is the hormone for the prevention of menstruation during pregnancy. I really appreciate your help. Thank you.