High estradiol after pregnancy is normal and does not need to be treated. High estradiol levels will thicken the endometrium, which is conducive to embryo implantation and growth. If the level of estradiol is too low, the endometrium will not develop well, which will easily lead to a weak embryo implantation, and may lead to preterm miscarriage or embryonic abortion. In the early stages of pregnancy, the ovaries secrete a certain amount of estrogen and progesterone to help the embryo’s implantation and growth. After the third trimester, the ovaries no longer secrete hormones, while the placenta secretes a certain level of hormones to maintain the growth and development of the fetus. Normally, in the early stages of pregnancy, women need to have their blood chorionic gonadotropin, progesterone, estradiol and gynecological ultrasound checked to determine the growth and development of the fetus based on the results of these tests.