If you have had regular 28-30 day cycles prior to this and if you are very sure about your dates, then according to the sonogram report, your pregnancy
is not doing well as you have to show a 8 weeks pregnancy while it is only 4+ weeks. If, on the other hand, it is only a tentative date, your sonogram report is essentially normal. A repeat sonogram after about 7-10 days should reveal the fetal pole
and the fetal heart. The findings may be delayed sometime by a few days owing to poor resolution of the machines and the skill of the sonologist. Wish you good health.