Thanks for your query,
In first week ultrasound
, there may be variation of + or - 5 days. At present gestational age
of fetus is 6 weeks and 5 days according to the scan which is smaller than expected . In case of transabdominal ultrasound cardiac activity is usually visible at 6 weeks. But some times it may be difficult to locate in some cases. In those cases , repeat ultrasound is done after 1 week to confirm the cardiac activity whether present or not and to see whether growth of fetus is occuring or not.
So till then take care..
Hope it helps..