NEET BIOLOGY

Detailed explanation-1: -If the embryo is implanted, the cells around the developing embryo begin to produce a hormone called human chorionic gonadotropin. This hormone maintains the corpus luteum, which continues to produce progesterone, until the growing fetus can produce its own hormones.

Detailed explanation-2: -During the luteal phase, the body is preparing for the implantation of a fertilized egg. Progesterone, which dominates during the luteal phase, starts to increase. Meanwhile, estrogen levels drop after ovulation but then slowly rise, along with progesterone.

Detailed explanation-3: -Estrogen peaks in the days leading up to ovulation. This is your most fertile period. At the same time, estrogen thins your cervical mucus, a fluid sperm has to swim through to reach and fertilize an egg. These estrogen-induced changes make it easier for you to become pregnant if you have intercourse.

Detailed explanation-4: -This increase happens extremely rapidly and the amount of estrogen produced in a single day during pregnancy is just as high as that produced by a non-pregnant woman within three years. In early pregnancy only estrone and estradiol are initially increased.