correctly* not regularly. regularly and correctly are two different things- you need to take the pill regularly *and* correctly in order to be protected against pregnancy, regularly is taking it within your timeframe every day and restarting it at the right time after your break if your pill allows one etc, and correctly is doing that and accounting for things that could affect the pill- sickness and diarrhoea, antibiotics, herbal supplements that haven’t been researched as to whether it affects the pill, etc