i delivered at 33w but my baby was measuring 2 weeks behind due to placental issues. she was 3lb 8oz at birth, spent 3.5 weeks in the NICU to gain weight but she is home with us now and she's absolutely perfect. good luck!!!
I also wanted to add a note that something similar happened to my friend…she was only pregnant with one but her son stopped growing at 32 weeks or so. They did a whole bunch of tests, sonos and measurements and he never grew or gained any weight the last 6-8 weeks. The dr. were pretty stumped. However he was born perfect and healthy…just a little tiny. I hope this will help put you at ease a bit! Hang in there!