Bmi/ IUI

I went back to fertility clinic today they told me they need bmi of 19 but I am 7st 5"4 My bmi 17.5

But I know they need the bmi for

IVF

does that also count for

IUI

do you have to have a certain bmi for that?

Also to add I'm 28 been trying to gain weight Since being a teenager as it does affect me iv tried so many gaining drinks of the doctors and I love food I'm a big eater but it goes nowhere.