Doc said hcg level was a little low... Thoughts?

Hannah
Anyone have a blood beta hcg around 6 wks? My doc called and said mine was a little low for 6 wks (I was 5w6d) at the appt. It was 19220 miU/mL. She then preceded to tell me that if I felt symptoms that would indicate a loss of pregnancy to come in and have it checked again :/ When I look online it says that 1080 to 56500 is normal for 6 wks, which seems like a wide range.... But idk. Now I'm gonna be freaking out until my ultrasound on may 27th. Anyone with similar levels who progressed with normal pregnancies?