Gaining weight during pregnancy …. Moms weigh in

So I just hopped into my 2nd trimester & I have noticed I haven’t gained not 1 pound not even 1/2 pound this is my 2nd pregnancy btw according to my pre pregnancy bmi I’m considered over weight so I’m not sure it’s that why I’m not gaining but I’m a little concerned…

A friend of mine is a week behind me in pregnancy & has gained 16 pounds in her first trimester she is way smaller than me (normal weight) but I found it weird that I haven’t gained not 1 pound.

Is this common?