Is it to low?

Jenn

My initial HCG level was 12. I was 9 or 10 dpo. The nurse that called me with the level indicated that as long as it doubled when they draw the next one in the morning it was a considered a viable pregnancy. When I told my sister she started saying she was sorry it was so low and like preparing me for a non viable pregnancy. So now I’m confused. Should I be scared?