Ankle swelling, leg cramp, sudden weight gain

I've been keeping track of my weight and until this week, I had only gained 11-13 lbs. I am 29 weeks. Over the past week, I gained 6 pounds, my leg cramped severely 2 days ago and it's been very sore to walk on/use since. My ankle feels swollen and I've gained an additional 6 pounds. My leg doesn't feel hot or warm and my BP is perfectly normal. Husband is scared that something is wrong. Should I be concerned??