7.3 weeks abdominal sono


Hello I am now 7.4 weeks I was offered a free ultrasound at a free clinic but she did a abdominal view she said the sac measures 6.2 weeks or so and it was to early to see anything with a abdominal sonó... But I see the sac and she aslo said it wasn't empty it was just to hard to see I am a chubby girl so maybe fat was in the way.. Anyways should I be worried my levels are great my ob has me for a ultrasound on Friday and for sure that will be vaginally.. I don't want to loose another baby I loss one in March but I was measuring way off when I was 9 weeks the sac with fetus was only 6 weeks... Has anyone had this problem... Thank you