34 weeks measuring HUGE!

TJ
I had a growth scan today and my boy is measuring at 6-7 lbs! He measured 3.5 lbs about a month ago. The fluid measures low-normal, about half what it was last time just a couple weeks ago. The doctor came in and showed me his growth chart and it was wild! Measurements have been between 50-60th percentile from day one and now it's jumped to 97%. 
I am so sure the measurements are correct, or at least very close, because of how I've felt the last 2-3 weeks.  It feels like my body just can't keep up with him. I'm super out of breath and lightheaded and tired all the time (and not anemic!)  My mother-in-law hadn't seen me for three weeks and was shocked at how big my belly looks now.  
Has anyone else measured so big so early? Anyone had low fluid at this point? I have another growth scan in 4 weeks and I'm thinking this little guy isn't gonna make it much longer than that!