The main cause of most of the unplanned pregnancies is unsafe sex. This cause is more evident among teenagers who have sex impulsively without giving a thought about future consequences and do not care to use any kind of protection or contraception. Teenagers are the major victims of unplanned pregnancy.
Apart from this, another important reason for unplanned pregnancy is contraception failure. A lot of people think that all the contraception techniques are 100% effective but they are not. Contraceptive failures are common in couples who use it more often. Like frequent use of contraception pills can reduce their effectiveness. Moreover, while using tools like male condoms and female diaphragms, the user must be careful as to using it properly. If a condom or a diaphragm is not worn properly in the right position then it can fail and you end up getting pregnant. Breaking of condoms during heavy sex is regarded as one of the most common causes of unplanned pregnancy.
Myths and misconceptions in techniques like withdrawal (withdrawing the penis before sperm release) and rhythm (have sex during non ovulation period) also cause accidental pregnancy. These methods cannot be trusted. People believe it’s safe to have unprotected sex by these methods but the risks are high.