Just curios

So I tested 9DPO and got a BFP. I actually did six tests all different brands all positive because I couldn't believe it. I'm so used to seeing negative. Anyways I went to the doctor at 11DPO and confirmed that I was pregnant. My first appointment is in two weeks. I tested positive at 9dpo which was 5 days before AF was due. Does that just mean my hcg levels are high or should I be concerned?