I just got my period and I had it earlier this month, I don't know whether it is serious or not. I've had my period for 8 to 9 months now and this has never happen, I know I can't be pregnant I was never engaged in sexual contact.
If you only just started your period eight or nine months ago, your body could still be trying to find a normal rhythm. There can be irregularities at first. However, if you have this happen again next month, go to the doctor. Like Ash said, you can be put on birth control to regulate it if it becomes necessary.
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