What Are Noraml Periods Like I Thought My Period Finally Came But It Was Early An I Spottted, Then It Only Lasted For 3days Am I Prego?

I thought my period finally came but it was early an i spottted, then it only lasted for 3days am i prego? - what are noraml periods like

I had many symptoms of pregnancy in the last 3 weeks. I expected that my period was supoose the 15th Start but came on 11. I always have time to get noraml, but since my bf had unprotected sex is a symptom i havin I think I'm Prego. my period only lasted 3 days, it was bright, day 4 I had brown adipose tissue in my panties 5th Day nothing. Do you think I'm preganat?