Baby weight 26weeks 3 days !


I went to my appt An my doctor said everything looked great my baby boy is weighting at 1.10lbs An the apps I have say he should be around 2lbs already should I be concerned ? My doc didn't say anything or seem concerned I'm not very big idk if that has anything to do with it 5/2 weight 117 pre pregnancy weight is 98-100lbs