Low HCG level

Elizabeth
Help!!! I got a positive pregnancy test This week and I'm not late yet (period due Sunday the 26th) I went to the doctor to get blood work and my HCG levels came back at 44. They said they were fairly low possibly because it's very early. I'm retesting tomorrow, but I'm just so scared. I miscarried 5 months ago. Please anyone share your experience/opinions!!