Does anyone know what normal blood sugar levels are during pregnancy?

Ellie • Mama of 💙🧑🏻SBL 3.19.16 💙🧒🏼AAC 1.22.18 💜👧🏼CEA 1.7.20 💙👶🏻LOM 4.20.22
I've been testing my blood sugar because there was a concern for gestational diabetes from a previous metabolic disorder. However I've noticed that my numbers seem low. Like fasting it's been 65-75 and 2 hours after eating it's been in the 70s. I feel weak and I've been losing weight even though I'm eating loads of carbs/junk food and doing nothing all day. Should I be worried?