I would say you might have had a terrible technician!
I've gained 25 lb since doing IVF and getting pregnant, which skyrocketed my BMI to 36, and I had my 12 week scan last week with a bit of a drama getting a clear nuchal reading, but eventually we got there. It's hard if carrying extra weight because you almost always have extra fluid retention as well, but at least the baby is well protected in there!
Will they try again for a clearer scan? (hopefully with a more experienced tech)