Weight gain 😅

I started this pregnancy at 120lbs, given i was working out and eating really good…. i am now 35.5 weeks and at the Drs today i weighed 155lbs!!!! last visit a week prior i was 150, how in the possible hell did i gain 5 lbs in one week???! I walk 3 miles daily and eat generally well, i eat bad somedays but I feel like this is crazy, my face looks so fat and I am unhappy with my weight gain and I really don’t want to gain more but I have 4.5 weeks left (maybe more if i go passed due date) 😭😭😭😭