Brown period ??

My period was 2 days late and extremely light. It was exactly like this for the entire 7 days. And brown in color for all 7 days. This is the pad I had on all day. I could’ve used a party liner and been fine. This is not normal for me. What could it be? I could be pregnant but do you think pregnancy could cause this style of bleeding? I don’t have an STD I got checked just last week before the bleeding and haven’t had sex. Any insight?