Worried about weight gain-PLUS SIZE

I am 26 weeks pregnant and I was overweight when I got pregnant (around 260 lbs.) at my last Dr appt which was 4 weeks ago, I weighed 261. Now I'm up to 264.8 in 4 weeks . Is that too rapid ? My Dr hasn't said exactly how much weight I need to gain (or not gain) but he has been happy with me maintaining a steady weight. I didn't start gaining until later in my 2nd trimester . My appetite is the same as it was pre pregnancy. I am just scared to gain too much because I don't want to have a ton to lose after my baby is born