Measuring 3wks ahead...

I went to my midwife's yesterday for our 34w appointment (I'm 34 + 4) & have been constantly measuring ahead by about 3 wks for the last 2 visits. Oh, I had a little sugar in my urine yesterday too for the first time but she said she wasn't worried about it.  We have a growth ultrasound scheduled for next week to see if she is really that big or if I have extra fluid. They told me my EDD 8/16 probably wouldn't change either way but they just want to be prepared for what's going to happen in L & D to make sure baby and I will be ok. I'm a FTM and more or less just nervous about all of this...any experienced moms out there ever heard of or had this happen??