Need some help

Hi everyone, I’m a little confused on something. My period was 3 days late and usually when it’s late it still comes and lasts 5-6 days. This time it only lasted 2 days and the flow was pretty light. I passed some clots that were small but nothing like my normal period. Part of me wonders if I should test and see if I’m pregnant or not to. Only reason why I think I might be is because 6 days prior my boyfriend and I had sex and he came inside of me so I’m thinking it was implantation bleeding but I’m not sure.