Hcg levels

Hello, I am 4 weeks and 6 days pregnant with our rainbow baby. I just had my HCG levels checked yesterday and it was 313. Is this normal? I am nervous because I have been having horrible back cramps and I was nauseous before I found out and that has since gone away. I will go in for another test tomorrow to see if they have doubled but I just wanted to see if anyone else had a similar number?