How many days after pregnancy do you start having reactions? Every woman who wants to get pregnant is concerned about how many days before she starts to have reactions. Generally speaking, women will have pregnancy reactions after 7-10 days of pregnancy. This is mainly due to the increased secretion of progesterone, which affects women’s body functions and physiological responses. Women should pay attention to the following points during early pregnancy. First of all, pregnant women need to pay attention to rest and maintain a good mentality in the early stages. Early pregnancy is an important period of fetal development. Excessive fatigue and emotional instability can have adverse effects on the fetus. Therefore, pregnant women should actively adjust their schedule and mood to increase their sleep time.