Hcg levels in early pregnancy?

Tina
Ok so at 8 dpo I was getting faint positives on first response tests. Yesterday at 9 dpo I got positive 1-2 weeks on clearblue digital weeks estimator. I also had a doctor's appointment yesterday and they did a urine pregnancy test which was negative, so they drew blood. Got my results back today and my hcg level was at a 15. Is 15 ok for only being 9 dpo? I won't get another redraw until Monday.