Alright ladies major question!!!

So I’m 18 weeks and only ate a meal today ( one sandwich, 4 cookies from a tiny chips ahoy bag and a Gatorade plus water of course because I didn’t feel the need to eat) and when I ate I wanted to puke but thankfully didn’t! I keep getting cramps off and on all day only lasting a couple min! ( pain area shown on picture )

I’ve also been tired all day trying not to sleep throughout my work day. Does anyone know what could be happening I’m aware no one is a doctor here but I just feel off and would like to know if anyone else has felt the same and what the aftermath was!