Belle, I put on like 3kg. My daughter was 2.9kg so really the weight was just her. I was alos retaining a bit of fluid by the end of my pregnancy. My midwife never weighed me at my appointments, I just weighed myself at home because I was curious about 4 days before she was born and I was 3 kg more than my pre-pregnancy weight. I have a small frame too and people were saying annoying things like "oh your so small", "she's small for XXX weeks pregnant" , "you must be having a tiny baby" and so on. My daughter is completely healthy, she's just petite. Dont worry yourself over it.