I've got four that are all around 15 dpo if I hadn't done IVF (10 days past 5 day transfers) that are in my signature. As you can see, they're all very different!
With Kate, my beta was lower than yours at a later date but she doubled well and arrived safe and sound. With this baby, the first beta was higher, but only rose by ~66% for subsequent betas, but we're rapidly closing in on his due date!
The IVF clinics I've used like to see ~100 at the equivalent of 15dpo, but they're all much more concerned with how it rises after the first beta.