Thank you for your query.
If your periods were regular, then this finding is indicative of a failed pregnancy
Since you are obese, chances are that you had delayed / irregular periods
with delayed ovulation and hence delayed conception.
Ideally by 9 weeks, a well formed fetus with heartbeat should be seen.
Also, at 6 weeks, the fetal pole
should definitely be visualized.
However, giving you the benefit of doubt, you can take pregnancy supportive treatment from your obstetrician for maximum a week.
If the repeat ultrasound
( bear in mind that it should be transvaginal ) still shows the same findings, you would need termination for the failed pregnancy.
Spotting / cramping is not always a must for missed abortion