Gestational diabetes maybe??

Today I had an insatiable need for food!! I couldn’t stop thinking that I HAD TO EAT I mean like unimaginable... I’ve never had this before of this magnitude. Also I’ve been hungry and if I don’t eAt right then I get angry and an attitude if I don’t eat like I haven’t eaten in days or something. Could this indicate diabetes or I was thinking a surge in growth...help!! Also I don’t understand why they don’t test you until 26weeks?? Wouldn’t it be helpful to me and baby if we knew sooner??