Third trimester weight gain! 7 lbs in one month!

Anyone gain 7lbs in one month!? I have gestational diabetes so I'm sure they'll check his size soon but prior to this had only gained 6... I'm 30 weeks this weekend. But the 7 lbs was a shock today! Hoping to gain minimal as I was heavier than I wanted to be when we conceived... 7 lbs in one month! Yikes!