Taking progesterone after ovulation does not necessarily lead to pregnancy, the purpose of taking progesterone is mainly to maintain the function of the corpus luteum and play a role in helping to get pregnant. If sex occurs after ovulation, the egg and sperm did not combine to develop into a fertilized egg, even if taking progesterone will not be pregnant, women will not routinely take progesterone drugs after normal fertilization and pregnancy. Progesterone-based medication can only be given to keep a woman pregnant if she has a prior miscarriage such as lower abdominal pain and vaginal bleeding, and if it is caused by low progesterone levels. Or when a woman is given a certain amount of progesterone for treatment only after an IVF transplant in order to help the fertilized egg to settle, grow and develop in the uterine cavity. Whether or not a woman needs to take progesterone after ovulation needs to be decided only according to the physician’s orders, and taking the medication privately can also cause adverse effects.