5 weeks pregnant and no identifiable sac

Ke • Tue, Jul 17

The first day of my period was June, 12th. So according to that I am due the 19th of March. I took a pregnancy test today and it came back positive. So I went to the doctor, my HCG levels were 3119.0 but there was no sac. Is that normal? I never experienced this with my two boys.