Spotting for 5 days

So this is quite unusual for me. I usually eill spot for 2-3 days then get my period. But this month it's strange. My period is due on 1/25/16 but i started spotting last week on 1/21/16. Now mid day today 1/25/16 it stopped. My bf and i did have sex about a week and half ago. Not sure if i could be pregnant but spotting so early and for 5 days is unusual for me. Any advice would be helpful thanks! 🙂