Advice and help scared

12 weeks pergnant and I'm worried I'm toxic and harming my baby ! I drinking mainly water but sometime durning the day i have a cup of juice with half ice cube ! Time I drink it mainly water down ! Im really afarid I can have Gestational Diabetes! But ever time I ask the doctor how my urine test went or blood he says its normal and I shouldn't be worried!?? Does this mean I might just pass Gestational Diabetes I need some advice please (diabetes run in my finally ! My mom has it and so did her farther and I don't think her mom had it )