No Weight Gain at 16 Weeks

I’m wondering if it’s normal to be this far along and have not gained weight? I had some food aversions during the first trimester and lost about 3 pounds. I have yet to gain anything back. At my 12 week appointment my doctor said it was fine but I should aim to gain around a pound a week for the remainder of my pregnancy.

I’ve been counting calories and aiming to eat at least 1900 a day. So far I have only maintained the 3 lb weight loss and have not gained anything back. I’m 5’7” with a healthy BMI- not underweight or overweight- so it seems odd that I haven’t gained anything. Anyone else experienced this?