FThank you soo much! I really needed to hear that...im gonna be more careful from now on.
Yes, you are most likely not pregnant. Though the only way to know for sure would be to take a pregnancy test, but since you got your period I would not worry about it. You may want to make a doctors appointment to look into birth control methods and what will work best for you. Plan B should try to be avoided, because it really shocks your system with a lot of hormones.
It's bleeding from taking the plan B pill... Plan B will screw up your cycle. It can make your period lighter or heavier than normal. It can also make your period come earlier or later than normal or come twice in one month. Plan B has a lot of possible side effects as well, like nausea, an appetite change, vomiting, and so on. It is to be used only in emergencies and really should not be used more than twice in one year. Next time you have sex, use protection to avoid pregnancy and STD/STIs.
It's definitely your period. Implantation bleeding is generally a day or two of light spotting, and usually only when you wipe - not enough to use a pad or tampon for. Anytime you have unprotected sex, you run the risk of getting pregnant. Stress, bodily changes, new sexual partners, and sexually transmitted diseases/infections can delay your cycle. Having unprotected sex not only increases your chance of pregnancy, but also for diseases and infections that are almost always incurable. Please be more careful. If you are not sure if you can handle the responsibilities and consequences that come along with having sex, it may be time to re-evaluate if you are ready for it.