First ulrasound

Does my baby look like it has been measured accurately? The person that done the ultrasound (professional) had said to me and my SO that he really didn't care as it was just a blob and didnt have arms and legs (his own words) , i felt so upset and wanted to bawl my eyes at his wording... he said i am 7 weeks and 6 days but that doesnt add up as i had my period when i apparently concieved, i also didnt have intercourse the week before or during my cycle... i feel like i'm at a loss here and have no one else to ask. TIA!!