Extreme weight gain in the final weeks?

Makayla • Baby girl was born! 7/12/19 💕

So for most of my pregnancy I hadn’t gained a lot of weight. Up to my last appointment I had gained 13 lbs. well I checked my weight yesterday and it said I gain 10 lbs more! What?! I’m 36 weeks and 2 days; and a ftm. Has anyone else gained a extreme amount of weight in a few weeks?