Baby same weight as 2 weeks ago!?

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I had a growth scan 2 weeks ago because bump was measuring big so the scan said at 34 weeks baby was 6lbs 3oz. Had another scan today 2weeks later an baby is 6lbs 3 oz.. has anyone had this? The consultant has just said yo have another scan in 2 weeks and watch out for reduced movement..i feel worried but she didnt seem too worried..?