It doesn't just add two weeks randomly..if you had irregular periods than that could change your dates at a scan..for example, by much last period my baby would have been due 26 June but i had my scan and i am now due 6July, this clearly means i ovulated later than usual.
So the ultra sound does in fact add two weeks?
yup 4weeks is too early to see anything. u should wait another 3weeks before u Do another scan. if u want u could go in for a transvaginal scan at the moment. maybe u could see somethin through that. however it is way too early to see anything through an abdominal scan now.
Heyy I thought the sono was always off a week or a week ahead ask the doctor they would know for sure