Hcg level 36

Bi

Yesterday I got my bfp after having a miscarriage last month on September 19th. Called my doctor and had blood work done. The doctor called today and said my level is on the low side at just 36. I was just 10 dpo. The app says 3 weeks and 4 days pregnant. I know that my next test (tomorrow) will say more but I guess I didn’t think 36 was low considering I still had days before a missed period. If I wasn’t already anxious her words ( on the low side) just made my fears spike. What are some of your numbers at 3 weeks and 4 days?