Hi!
I just thought I'd post my experience. I was 63kg when I started my IVF cycle, 69kg at my heaviest during pregnancy. I was carrying twins! I am now the lightest I've been since I got married 9years ago. I ate as much as my little tummy could hold during pregnancy, not always healthy but well, I just didn't have enough space. The babies turned up at 37weeks weighing 4 and 5lbs. They always measured small but well enough and noone was worried except me. Like you a tiny bump especially when I said it was twins people would look aghast. I like you would jump on scales wherever I saw them!! Slightly obsessed me! I did stop using the Wii though cos it kept telling me I'd been eating too much!!!
I've stopped feeling guilty about the babies not growing enough because of me. They just ran out of room! I've started to be grateful for the best weightloss regime I could have ever asked for!
LIke the others have said if noone else is concerned and your baby is moving and measuring well on scans then I wouldn't worry, I wish you all the best for the rest of your pregnancy, stop worrying and enjoy it!