Fetal Low weight gain

Between 28-30 weeks, my fetus gained slightly over 500g, and he has always been in the 69th percentile. but this time when I went for my check at 32+5, he only gained about 130g. My gynae says he’s growing well & in the right range although I kept asking if this weight gain is too little. but when I checked online, a healthy fetus should be gaining abt 200g per week at this age. Did anyone have experience with such an issue and still managed to deliver a healthy baby? Just need some reassurance.