Im nervous.. im 16 weeks and i dont look pregnant. Just fat!

Im 16 weeks and i dont even look pregnant. I dont really even feel pregnant :( i cant fit in any of my pants so ive been wearing maternity pants since 13 weeks. thats pretty early to start wearing maternity clothes isnt it ? :( i feel huge. And i cant stopped eating..

Sometime i eat healthy and some days i dont. im actually going through a hard time even waking up for working, being tired during the day. Anyone else in the same boat ? Im still pregnant even if i dont look or feel pregnant right? I cant wait to go to my next doctor appointment and see that my baby is okay. :(

Also the maternity pants are comfortable because they arent tight.. but they fall off me all day i have to pull them up. Is that because i dont have an actual belly yet?