Generally speaking, douching is not a good idea if you're trying to become pregnant. Douching alters the pH balance of the vagina. Sperm needs the alkaline-acid levels to be more or less balanced in order to live. In addition, if you douche, you're flushing much-needed cervical fluid out of your body. This fluid gives sperm an easier and quicker path to the uterus and beyond. Inserting anything into the vagina can introduce infectious agents into the reproductive tract. In general, douching is okay, but it can reduce your chances of becoming pregnant.