Period or spotting

Okay so I had my last period. But my period for this month was 6 days late and I havent had sex in well over a month. My last one was July 3rd , it lasted a week like usual. And I started what I thought was my period this morning around 7. It was really light and I thought I caught it right as it started but its been 4 hours and it's still really light. Is it my period or could it be spotting from being pregnant :/