Final answer:
Pregnancy can occur when there is a failure in the use of birth control methods. Forgetting to take contraceptive pills regularly or experiencing issues with condoms can increase the risk of becoming pregnant.
Step-by-step explanation:
Pregnancy may occur due to failure of birth control methods. For example, if a person is using a contraceptive pill but forgets to take it regularly, there is a higher chance of becoming pregnant. Similarly, if a condom breaks or slips during sexual intercourse, it may result in pregnancy. It is essential to use birth control methods consistently and correctly to prevent unintended pregnancies.
Learn more about Pregnancy and Birth Control