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Bleeding commonly occurs 7 days after taking the morning after pill. This is a completely normal expected response indicating it's effect. So, no need to worry about that.
Remember morning after pill contains hormones, that may have affected the normal cyclical changes of hormones in your body, that is causing somewhat altered pattern of your periods. It will settle soon. But if your periods are too late you should do a pregnancy
More important for you is to use a regular contraception
preferably along with a barrier method, as you are too young & probably not ready for a pregnancy. You should discuss about this with your parents & a gynecologist to prescribe you one. Take care.