hCG levels?

Madisen🍊

I'm having a hard time understanding exactly how hCG levels should rise. My first blood test was 4440 and 48 hours after that was 4707. The nurse that called me said its not as high as they would like to see. Because of all the uncertainty im becoming super anxious and worried. This is my first pregnancy and we have had lots of trouble getting pregnant. Should I be worried?