What is the sonological point that should for meticulously to assess the possibility of ongoing pregnancy at 6-8 weeks? This is also called VIABILITY SCAN?

1 Viability scan can be assessed  a)  by measuring  & comparing  GSD in comparison to stated LMP or IUI or embryo transfer b) CRL –is it proportionate to GSD/LMP 3) Liquor amnii amount-volume measurement 4) Cardiac rate=-Normal/ Brady/Tachycardia 5) Disappearance of C L of pregnancy 6) Irregular sac or regular outline 7) Decidual thickness , In addition to this SCH(Subchorionic Hemorrhage ) & beta HCG serum level will offer an overview of preg outcome, There are monograms of all these i.e. GSD, HR, CRL with LMP if date of ovulation was monitored, Any deviation from  Standard monogram will spank that viability of current pregnancy is poor, It means that not all will abort but some may abort,. Guarded prognosis.