When did you start eating more?

I’m currently 24 weeks and I’m still not very hungry. At dinner I eat the same amount as pre-pregnancy, which isn’t very much. Actually, my 3yo son can eat more than I can🤷🏼‍♀️. Will I ever start eating more? Somehow I’ve managed to gain 14lb by switching to whole milk and snacking on avocados, dried fruit, almonds, etc. but it’s been a struggle to make myself eat. Will I ever get hungrier so I can eat more and gain more weight? My OB wants me to gain a total of 26-40lb by the end because I was underweight to begin with.