16w tomorrow...haven't gained weight yet

Charlie
Anyone else in the same boat? I go between 130 and 133 this pregnancy and pre pregnancy I was always right around 135. I haven't seen my OB in a while but several apps say I should've gained a few pounds already. I'm worried baby isn't growing or I'm not giving her what she needs. I also have no visible bump which makes me worry that she isn't growing either!