Taking birth control pills will not affect future pregnancy, but taking birth control pills frequently for a long period of time may cause irregular menstruation and ovulation or gastrointestinal damage. 1. Irregular menstruation and ovulation: taking birth control pills for a long period of time will destroy the hormone levels in the body, affecting the normal physiological cycle, leading to irregular menstruation and thus affecting ovulation, resulting in irregular menstruation and ovulation. 2. Gastrointestinal damage: frequent use of birth control pills will easily stimulate the gastrointestinal tract, which will cause abnormalities in the digestive system, thus causing gastrointestinal damage, and in severe cases, nausea and vomiting symptoms will also occur. The purpose of taking birth control pills is contraception, which will not affect fertility, so it will not affect future pregnancy. If you feel unwell as a result of taking birth control pills, go to the hospital and follow your doctor’s advice.