Hi, I just had a scan at 6 weeks 1 day and we got to see the heart beat and they measured the blob from crown to rump ( not that i could tell which end was what ) this ultra sound i demanded after having some pretty wild cramping which turned out to be over stimulation of the ovaries caused by IVF drugs so don't feel bad asking for something that is going to reassure you i have had 4 Bloodtests to measure HCG levels just this last week the doc said to me that enough is enough she won't be issuing any more Bloodtests requests ( hehe )