helped counter that), then she went on progesterone as soon as she got a bfp.
and found this on healthywomen . org
"During the reproductive years, the pituitary gland in the brain generates hormones that cause a new egg to be released from its follicle
develops, it produces estrogen, which causes the lining of the uterus to thicken.
Progesterone production increases after ovulation in the middle of a woman's cycle to prepare the lining to receive and nourish a fertilized egg so it can develop into a fetus. If fertilization does not occur, estrogen and progesterone levels drop sharply, the lining of the uterus breaks down and menstruation occurs."