Plus size moms only please

Hey I have just a fast question for plus size moms that aren't high risk and won't be receiving anymore ultrasounds the rest of the pregancy. My doctor says she will feel my belly to see if the baby is head down ect. But I'm a big girl I have rolls on rolls and my belly is big already at 250lbs, I can hardly feel under my fat let alone guess what position the baby is in. My other pregnancies I was high risk and had tons of US with this one I'm normal and won't have anymore. Im trying to avoid a c section and would really love an ultrasound near the end but my doctor says no more for me unless I develop a high risk problem. I don't really believe her to tell me what postion the baby is in lol what  am I going to do??