Bleeding during Pregnancy (Might be TMI)

I am 5 weeks/ 5 days and a few days ago I bled for 2 days. It was pretty light and was more of a brown color than red. I've been told it might be implantation bleeding but it seems a little late for that. I thought implantation would be around 12 days after conception and I've known I am pregnant for 2 weeks. The time frames don't add up. Has anyone else bled a little? Is it a complication?