Period or spotting?

I started bleeding today and it's about a week before I usually start. I've always had a normal period cycle. It's a light pink blood and it's not very heavy. Heavy enough I wear a tampon because I don't like liners but not as heavy as my periods normally are. I was not blessed with light periods. I have had unprotected sex a couple times this cycle. Should I take a PT in about a week or could it just be my cycle changing ?