I am 165cm and was 96Kg when I got pregnant which gave me a BMI of 35. I am a size 16 and don't consider myself huge, plus I walk for at least an hour a day most of which I am pushing a pushchair so am reasonably active. I know that my problem is I eat too much! I eat less now as with my first pregnancy I could only eat small portions and have made an effort to keep to those portion size but I would then eat a lot of chocolate/biscuits/cakes etc.
I lost 14 Kg in the first 3 months with my first pregnancy and at full term weighed less than before I was pregnant due to sickness.
THis time I have lost 7Kg and had my booking appointment earlier so I had a higher BMI. The guidelines at the moment are those who have a BMI 30 and over have a Glucose Tolerance Test to check for gestational diabetes and extra growth scans to check the size of the baby. A BMI of 35 and over means you have consultant led care.
As I had a 8lb12 baby last time who was 2 weeks over due I don't think I am at particular risk but am following what I have been told at the moment. I am much fitter this time around and have always had low blood pressure.
The extra monitoring is a pain because it means more time off work and I am self-employed but the biggest issue for me is whether I will be treated as high risk and stopped from having the natural labour I would really like to have and didn't manage last time because of induction.
I have put your details into a BMI calculator and your BMI is 29.5. So you would be on the border for extra monitoring, if you would like as little intervention as possible I would suggest you shift a bit of weight before getting pregnant. Have you looked at how much you eat as well as what you eat? Make a diary of EVERYTHING you eat in a day it may surprise you.
As for shifting weight I would say that really depends. I was 96Kg at full term and 2 weeks later was 74Kg. I don't think that is the norm but my baby liked his milk!! I put weight back on with every feed he dropped until I stopped feeding him at 15months totally and was nearly where i started before pregnancy
Sorry this ended up a bit long, might give you some things to think about though