I have put on 9 kgs this pregnancy. Wondering where all the weight is going since baby is only 3kg.

Other than your baby, the weight of the placenta, fluid and blood also adds to weight gain. Women of normal, healthy BMI should expect to gain about 11kg to 16kg, more for underweight women and less for overweight women. http://pregnant.sg/articles/dr-chew-answers-pregnancy-weight-gain/