You must not drink coffee during pregnancy preparation for the following reasons: 1. Coffee contains a lot of caffeine, if you inhale too much caffeine, it will lead to a decrease in estrogen secretion, estrogen is very important for women, if the level of estrogen in the body decreases, it may damage ovarian function, which is not conducive to ovulation, and the chances of conception are reduced. 2. Young women who drink more than 3 cups of coffee a day are very unfavorable to the preparation for pregnancy The chances of conception are lower than those of women who never drink coffee, so it is best for people preparing for pregnancy not to drink coffee. 3. It is best for women not to drink coffee during pregnancy preparation, as coffee can excite the uterus and is not suitable for drinking during pregnancy preparation as well as during pregnancy. If you really want to drink something, you can use fruit juice, vegetable juice instead of coffee, and make sure not to drink carbonated drinks either, which are bad for your body.