Zo
i think your weight gain is very normal. i gained 5.7kg at week 20 and now at week 24 havent go for check up but sure gained another 3kg+ already.. my gynae said no more than 12kg is alright, although i believe i will gain more than 12kg this time round...
placenta low is normal, i had that for #1 and now for #2 same thing, placenta low again, last time it moved up around 7th month.. so no worries..
as for baby's weight, my gynae last time never measure at all, only estimate based on head size right before my delivery.. my #1's head is big and he said at least 3.6-3.7kg.. end up less than 3.2kg only.. but even he estimated a big baby, he checked my pelvis size at week 37 and encouraged me to go for natural delivery.. so don't worry too much as it's still very early now..
i can see this pregnancy is quite a tough experience for you, cheer up, your baby girl will feel your emotion and you must be a happy mummy to deliver a happy baby!!
ssmilezz
i don't find changing table necessary at all.. but just a side note, if you put baby on your bed to change diaper, remember to sit down on the bed or on a chair, rather than stand there then bend over, will get back pain after a few months..