Missed pill, can I be pregnant?

Dear Ask The Doctor: Hi, I take Cerazette every day as my birth control method. I had sex the night before last but missed my pill last night. I've just taken the missed tablet but I'm now about 20 hours late in taking it.. Will I be ok or is it possible I could fall pregnant?"

Dear Louise: Since you have missed just one pill, the chances of becoming pregnant are minimal. However, you may require to use an added contraceptive measure (eg. condom) till your next periods.