I'm about 10 weeks pregnant and my appetite has dwindled. Is this normal?

For example: Before pregnancy I could go to Chick-Fil-A and order a 4 count Chicken Minis meal (with hash browns and a drink) and I could eat the entire thing, no problem. Last night, I had dinner at about 6 pm, woke at 6 a.m. this morning and began eating the Chick-Fil-A meal at about 8:45 am. I only ate 2 chicken minis and ate maybe 5 little hash brown/ tater tots, but I don't want any more. I haven't even drank half of my lemonade. Sometimes, I have to force myself to eat because I'll look up and realize It's been 8 hours since my last meal. I'm not nauseated or repulsed by food, I'm just NEVER hungry. Has anyone else had this experience? Should I be concerned? I'm 5'8 140lbs in a size 4/6... for now.