The pill contains estrogen and progestin. If you forget to take it, it will cause vaginal bleeding on the one hand, and more importantly, it will affect the contraceptive effect on the other hand, so if you forget to take the pill, you must take it within the shortest possible time. Normally, if you forget to take the pill within 12 hours, you should take one pill as soon as possible, and the next day you should take the same amount as before. If it has been more than 12 hours, it is better to take two pills the next day so as to maintain the level of hormones in the blood and not cause vaginal bleeding, and also to play a role in contraception. Short-acting contraceptive pills are usually best taken at a fixed time each day, so that you can avoid missing doses and it is easy to ensure the level of hormones in the blood each day.