If you are gaining more than a kilo and a half per month then watch out. This could be a sign of gestational diabetes or fluid retention. Gaining too much weight during pregnancy can also make delivery difficult. Excess flab can make passing the baby more difficult!
It will be helpful for you and your family if you start making a list of what and how do you want to manage your delivery and post partum. You may not be able to remember things especially when in labor so keeping make a list and keep it with your parents/ in-laws or other close relatives if necessary.