What does progesterone suppositories in early pregnancy? Does it makes cervix higher? And by how many times it decreases the chance of misscariage?

Progesterone. is produced by the Corpus luteum early in pregnancy to keep the fertilized egg implanted in the uterus and growing, around 12 weeks this function is taken over by the placenta. So suppositories early in pregnancy supplement for low progesterone to prevent miscarriages.