I went for my scan at 25 weeks 1 day. I am 26 weeks 3 days today, got a call from my midwife yesterday and she said measurements were small from the last scan. I quickly went through the cd I got with my scan, and it showed measurements at 23 w 6d/23w 2 days etc.. I am booked for another scan soon, though midwife said nothing to worry, it just means we have to keep closer eye on the baby and get you in for regular scans but I cannot help it.. I am very stressed right now... can't even sleep properly..
Try not to worry, babies grow at different rates, the main thing is that your baby looks healthy and is active. My 1st child was just 5lbs 13 when born at 40 weeks but perfect. Relax as stress is no good for you or baby xx