Can you be pregnant if you use birth control?

Yes!

A person can still get pregnant if they are on birth control.

This may occur for a couple of different reasons. One reason is taking other medications. Other medications such as antibiotics may make the Birth Control ineffective.

Also, misuse of birth control may be a reason. Also if the birth control is making the recipient ill, and the birth control is vomited up, it will not be effective.