Calories

How many calories are you ladies getting a day? I'm 27+ weeks and still only managing to get in 1500-1600 a day with 30 min of walking. I feel like I'm always eating but it's all pretty healthy stuff like fruits and veggies which is not bumping my calories very high. Doctor says baby is growing fine though and I  seem to still be gaining about 2 pounds a month so just wondering how everyone else is doing with this.