It is also very common to get pregnant after taking birth control pills. Both short-acting contraceptive pills and emergency contraceptive pills can cause unwanted pregnancy after taking them, as follows: 1. short-acting contraceptive pills: once you miss a dose, you may get pregnant, so it is recommended to take short-acting contraceptive pills as soon as possible within 12 hours after you miss a dose; 2. emergency contraceptive pills: there is also a 4% failure rate, perhaps because before taking the oral emergency contraceptive pills, the egg has been discharged in the abdominal cavity, and also In this case, the emergency contraceptive pill does not necessarily affect the development of the embryo, but after pregnancy, you need to take pregnancy tests as scheduled.