23lbs by 30 weeks... is this normal

Victoria
Morning Lovelys! 
Today I had an appointment with my new doctors surgery, she checked my weight and height and said I was showing as 'obese' on the BMU chart. I did explain that I'm 30 weeks pregnant and no concerns had been raised at my previous doctors surgery. However she was a little concerned and has referred me for diabetes test, which is no problem at all. 
Anyway, I wanted to see what you ladies thought? I am 5ft3 and started at 153lbs (slightly overweight to start) I'm now 176lbs so have gained 23lbs... is this a normal weight gain? Or am
I overdoing it? I am eating a lot more than normal and exercise is somewhat non existent since I got to about 15 weeks, so weight gain is to be expected. I wasn't massively concerned myself but now feeling like I need to watch what I eat abit more for the last 10 weeks...