It is possible to get pregnant even after taking the 21-day pill. The 21-day pill is a short-acting contraceptive pill, which is more effective, but does not provide 100% contraception. If you take the pill on time during your menstrual cycle, most people will not get pregnant if there are no missed doses, but we cannot rule out the possibility of contraceptive failure in a few people who are not sensitive to this drug or have poor absorption. Although the success rate of avoidance of short-acting contraceptive pill is high, it is not recommended to take it frequently, and other contraceptive measures should be taken appropriately, such as wearing a ring, using condoms, etc. Tubal ligation is also an option if you already have children and have no intention of having children. In addition, since birth control pills are synthesized from estrogen and progesterone and may cause fetal malformations after taking them, careful consideration needs to be given to whether or not to keep a fetus from an unplanned pregnancy during contraception. If you choose to keep the child, you must go to the hospital for regular maternity checkups to monitor the development of the embryo through ultrasound. If any problem is found, the doctor will recommend the choice of medication abortion or abortion surgery if the situation is serious.