Calorie needs during pregnancy

So I am in my second trimester and my doctor told me that I need to eat 3000 calories per day.... I am 5'2 and weigh 110.... I weighed 93 lbs to start out with... does this sound right? How in the world does one human consume this many calories (me being this small that is... I can see a taller woman eating this but I can barely eat 2000 being pregnant) how may calories do you ladies eat roughly and what are your current stats? I am 18 weeks and 1 day today.