My Dr always did it, but mainly to make sure I was growing. With Paige I was about 43cm at 39 wks, and she did feel very big, but she could have been a really long 6lb baby IYKWIM? it is so hard to tell baby size from fundal height. So don't panic too much about it. One of my friends never had her Ob measure, he just did an U/S at every visit.