Fundal height and baby size?

At my appointment today my Dr measured my belly/uterus and said it was 31 cm, I'm only 26 weeks and 5 days. She didn't say anything else about it and didn't seem concerned so I'm not worried about anything but since it's big does that mean I'll have a large baby? My first 2 babies were both 9 lbs 2oz both c sections and I was hoping for a vbac. Would having a big baby affect my chances of having a successful vbac? I'm also overweight.