Mismatch in calculations


I went for my first US today measuring 8w and 1day ... but on US it turned out to be 6w and 5d ... but I had a FHR of 128 which is good ! They took blood for checking my HCG levels ..

But 9 days mismatch is killing me . Dr said I will have a scan again in 2 weeks just to make sure everything is perfect ..

hope is the only thing I could do now and pray for the little one .

Please share your experiences if anyone has gone through the same !