I think we’ve all been in the situation where we’re not sure if our birth control method is working, had a condom burst, or had unprotected sex then regretted it.
Previously, if you didn’t want to be pregnant, you would have to assume you were fertile every single day and take emergency contraception (EC) regardless of when it happened. But now, since you’re using the fertility awareness method, you can know exactly when EC is needed and when you can relax and not have to think about it.