It's all based on your weight before your pregnant really. If you have extra weight on before your pregnant you usually lose weight at the start or stay the same weight which is what happened me, I was losing weight as he. Was gaining it so my weight never changed, I'm now 32 weeks and have put on about 3 pounds which I should have put on nearly 2 stone if not more, I had a scan last week and he measured perfect for what he was meant to so hopefully I'll be 2 stone lighter when he pops out ha :)
I lost 30 pounds. 23 weeks now and just started gaining back. Doctor is not concerned!
I've lost about 10kg so far (37 weeks now) due to constant vomiting, the baby is a healthy size so my doctor isn't worried and so far nothing has stopped it. Who would have a thought that sometimes pregnancy can be the best diet lol