Scared! Haven't felt movement anymore.

Amanda • Endometriosis fighter. Mommy of a 5yr old daughter and baby #2 due mid August!
I'm so worried! Only felt baby Jase move three times yesterday. Usually it's every other hour or so, and lots of kicks. Still hasn't moved this morning. And didn't last night either. I'm trying to calm down because maybe he's just facing the other way? 😢 
I'm gonna get some OJ before work and see if that'll wake him up. I also read that if I'm dehydrated it hinders movement which now that I think about it I haven't been drinking near enough! How do I know when to go to the doctor??