girls who are super duper tiny

Savannah

I weigh about 112 and I'm 5'2. I'm a tiny person it's always been hard for me to put on weight. I am now 19 weeks pregnant and still look like I just ate alot lol my question is girls with the same body type when did you lady's actually start to have a belly to where people knew you were pregnant? this is my first baby, here's a pic from yesterday