No period In 2 months?

My last actual period was July 21st. Not much happend August except for a little spotting for a few days but it wasn’t really a real Period, it was like brown like old blood but never nothing else. Nothings happened this month yet and I can’t be pregnant. I’m not on birth control and haven’t change diet,... show more My last actual period was July 21st. Not much happend August except for a little spotting for a few days but it wasn’t really a real Period, it was like brown like old blood but never nothing else. Nothings happened this month yet and I can’t be pregnant. I’m not on birth control and haven’t change diet, medications , weight or had much stress. I’m 18, any advice? I’m kind of freaked out
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