Looking my age. PLEASE HELP

Ok so I’m 20 years old and a little over 21 weeks pregnant. But, I look 15/16. I’m scared of gaining weight in my face and looking even younger (and pregnant). I know I shouldn’t worry about what others think, but that’s way easier said than done. I see the way people already start to look at me, I’m also pretty small (5’1”) and starting to show. I don’t know if this is where to post stuff like this, but I would really appreciate any tips on makeup/clothes/anything that’ll make me look my age. I don’t want to look older than I am, just not 15.