@GorgeousX we don’t know if you’re pregnant. You should take a test 3 weeks after you’ve used plan B.
You should never use plan B as a just in case because the hormone intake is massive. It can mess up your body for weeks and even months. This is why your bleeding might be irregular for the upcoming weeks and months. For this time plan B was necessary, but don’t use it as a just in case or replacement for birth control. That’s not what it is meant for. It’s referred as emergency contraption for a reason: emergency only.
Hormonal medicines aren’t a joke, definitely be more responsible with them and do more research on the pill before you have sex without a condom again. It’s better to know how everything works than put yourself at risk or unnecessary worry.