Yes contraception can fail to work in instances like being given the wrong instructions on how to use the pills or device eg condoms. Another cause for failure is staring the the oral contraception at the wrong time.
How do i tell my parents am pregnant?
Honestly telling your family—especially your parents—is quite nerve-racking. But you need to open up and tell your family how much you appreciate their support when you discuss your unanticipated pregnancy with them.
You can also try finding a social care counselor to assist you tell your family about the unplanned pregnancy on your behalf.