Gestation sac 12mm x 5mm x 12mm is this likely a blighted ovum no yolk sac present docters estimate 7 weeks by lmp my dates 5 weeks 4 days hcg increas?

Must know HCG level: The correlation between the sonographic findings of a 12 mm mean gestational sac is much better with your blood betaHCG levels than with your estimated gestational age of 7 wks by LMP. If your betaHCG is rising appropriately and you are feeling fine, another well timed sonogram may provide you and your doctor some reassurance or a better sense of direction.