Help? 😔😭

I got my bfp on Monday, and have been having pretty bad pains on my left side, so I went to the er and they took blood, blah blah. They did an ultrasound, which was clearly to early to see anything, but the blood test came back and my hcg count was 52, based on my last period I'm 3w6d. Is that low? Should I be concerned?