So, you missed one day, took it the next day then were just late by a bit the next couple days?
Or you missed three days straight and then took the three missed pills?
Especially if it's the latter, I would get Plan B. Be aware it is a huge dose of hormones and therefore can cause you to start bleeding then, spotting, or even delay your period.
The first situation, I'd say you'd probably be fine.
You should be fine but i would take a Plan B just in case. I would always just keep some condoms around even while on birth control just to be safe. (pull out doesn't matter, I got pregnant just from one time and he pulled out)