Rapid weight gain at (nearly) 36 weeks??

So I've been tracking my weight gain at home on my scale, every 2 weeks since October I've been gaining approx. 2 lbs. This week I decided I should start checking weekly since we're nearing the end, so I weighed myself this morning and since it's only been exactly a week since I last weighed myself I expected to see about a pound-ish, but somehow I've gained 3 lbs in one week which is definitely not consistent with how the past several months have been. Do you think this is just normal for the end of pregnancy (FTM so not sure) or something else? I’m exactly 35+5 today. TIA