I think I just had my period but I'm not sure, because its brown. I don't know if it is or not. I'm only 14

This may sound gross, but does it smell ? If it's a normal healthy body smell it probably is your period, but if it smells bad or unpleasant, you might have picked up an infection. Have you been ill or under the weather lately ? Infections can take a hold when your resistance is low. I would suggest, in the first instance, a little chat with your Mom or an elder sister if you have one. Good luck.