Low rising HCG

I got a positive on 10 dpo this cycle and went in for an HCG beta on 11 dpo. My HCG came back at 18. Today (48 hours later) it only rose to 26. My nurse wants me to come back again in 48 hours. Any success stories with low rising HCG like this?

I am definitely guarding my heart and preparing for a chemical as I’ve had one in the past.