Super short light period?

Okay ladies im just a little worried, my period started off weird, i typically get a lot of cramping tje day of my period, but this time i barely had any. And also very dark brown discharhe started spotting, then my period came. It was a lot lighter than normal and i wasnt cramping as much as i normally do. Also it only lasted one day, yesterday with a medium to ligt flow. Then today i was just spotting. So it basically only lasted 1-2 days which is vey short compared to my 5-6. I did have unprotected sex, but I usually do and never get pregnant. I dont want to jump to the conclusion of pregnancy. Anyome else have similar symptoms?