Pregnant? Or is my period just off?

The weekend of Labor Day Sept 1-4, my bf and I had sex multiple times, we never use protection, and of course he came inside of me. I was supposed to start my period on the 7th but nothing. I started spotting on the 8th then stopped. And spotted very light on the 9th and 10th.. like I mean veryyyy light it was just pink. So today nothing either. So I'm just wondering if I could be pregnant because we are trying, or if my cycle could be switching up? ..