I had sex last week on Thursday unprotected he came inside

This week on friday I started having brown spotting it was 8 days before i got my period

Ive been spotting for 5 days with mild cramping

Today i got alot of cramps and its 2 days early for my period and im getting a medium flow

What does it mean

Am i pregnant? Or not

Or is it normal for some girls?

Advice me please

Btw ive never had that brown spotting before a period started

Thats why I thought I was pregnant