Why is my OB saying my HCG levels increased but didn’t double?

I don’t want to use Google because I was told to stay off Google but what does it mean when your OB says your HCG levels increased, but did not double?

I have work later today and I’m kind of working myself up and making myself really anxious and now I’m kind of cramping. I just don’t have the mentality to even work until I know that my baby is OK for a fact. I tried for two hard years to get pregnant. I didn’t think it was possible and now that I’m pregnant it’s shocking and I’m really concerned by what my OB means by, “I t’s not doubling.” She wants me to go get bloodwork done this Monday. I have to do unnecessary traveling because I don’t know if I can bring my son in with me. And then I have work later that day too. I’m sad and scared and worried and I can’t explain how I’m feeling exactly. But when I found out I was pregnant it was so exciting and so emotional all that hard work and FINALLY. I pray and pray and pray my baby sticks 🙏🏼 I can’t cry anymore I cried all my tears out. I just want to know my baby is ok so I can go to work.