Preggers or nah

Okay so I'm 16, I was supposedly ovulating on the 18th of September. I had sex on the 7th of September(day my period started) the 12th(day it ended) 13th, 16, and 17. My period was supposed to come yesterday October 4, it didn't and still isn't here today, all the tests are negative though. Could I be pregnant?...

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