Sick after taking the Pill? Be aware it might not work

If you vomit or have diarrhoea within four hours of taking the birth control pill, then that means you no longer have guaranteed contraceptive protection and should use another form of contraception first. — dpa

It takes about four hours for the birth control pill, also known as the Pill, to be effective and prevent pregnancy after you’ve taken it.

So what happens if you’re sick or have diarrhoea in that time frame?