The main purpose of taking progesterone after ovulation is to replenish the body with progesterone to avoid causing infertility due to luteal insufficiency. If the corpus luteum does not function well enough and the corpus luteum shrinks prematurely, it may cause infertility or miscarriage even if the fertilized egg is already in bed without the support of progesterone, so progesterone is given orally after ovulation. Progesterone may cause dizziness, so it is best to take it orally before going to bed to avoid this condition. In addition, if you are allergic to progesterone, you should not take progesterone, you can use other methods to supplement progesterone, which can also be used for therapeutic purposes.