Is it possible to gain that fast? I have steadily gained 1 pound a week this entire pregnancy and I started at a healthy weight and haven't gained more than recommended but I'm at the high end of recommended gain. My doctor told me it's probably fluid but I'm shocked that happened because I haven't changed my eating/exercising habits and I only feel a little swollen. My rings and shoes are tight but they still fit. Has anyone else noticed sudden weight gain at 36 weeks?