Yup totally normal. Its pretty routine. You just drink a super sugary flavored drink (mine was orange, it wasnt as bad as people say. Just like orange crush soda without the carbonation) and wait about an hour or so then they take blood. Its very precisely timed. They usually want you to do it in the morning because you cant eat before doing it or itll skew the results. Its just to see how your body handle a high dose of sugar. Gestational diabetes can affect delivery, so its important to know if you have it or not. Dont worry too much, its not a big deal. Just another thing, like testing for strep.