Weight frustration!

Kimberleigh
19 weeks today!  Had a doctor appointment yesterday where they spent my entire appointment telling me to drink more water and to Start tracking my calories and not to gain any weight over the next month. She wants my calories to stay at 2000 or less. What calorie range have your doctors told you to stay within? I have gained 18 pounds but feeling frustrated especially when I see so many haven't gained any weight.