At 15, you are having sex. All I can say is hopefully you are being safe...thats your responsibility.It is normal for irregular periods at your age. If your period is still absent for a 6th month...you might want to visit your doctor. It could be due to hormonal levels, your food intake (healthy? weight?), stress etc.Are you pregnant or not, if the pregnancy test is negative. I'm guessing you aren't pregnant... but to make sure you Can take another test. But like you said...you don't have the symptoms so it is unlikely..

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