Does it sound like I am having a chemical pregnancy?

arianna

So I had an hcg blood draw at 145pm 9dpo (ovulation confirmed with temping and opks) and it cane back at 6. I know it’s early and sounds about right however I just took a test (15 hrs later) and it was still negative. It was one of those early first response tests. How does hcg rise? I know generally 48-72 hrs but shouldn’t I have enough to detect at least a positive by now? Expected period in two days.