Some women fear that they will become masculinized with progesterone treatments.一些女性害怕接受孕酮治疗会出现男性第二性征。If the egg is not fertilised oestrogen and progesterone decrease.如果卵细胞没有受精，雌激素和黄体荷尔蒙就会下降。If the egg is not fertilized, oestrogen and progesterone decrease.如果卵子未受精，则雌激素和孕酮的分泌会减少。