Thanks for writing to HCM
Single reading to Low HCG shouldn't make you worried.
Low HCG level needs follow up readings.
Many normal pregnancies continues with low HCG level. But,decreasing HCG level in sequential HCG estimation needs special care.
Viability of fetus can be specifically judged by Ultrasound
,not by HCG level.
Infact continuous low HCG level indicates about other conditions like miscarriage
, ectopic pregnancy
, blighted ovum
Your conditions needs repeat HCG after 48-72 hours and trans vaginal USG.
so, wait and watch and keep yourself cool.