Had you eaten a lot of sugar before going? I’ve had porridge before and I put a lot of treacle in and then it came up with glucose in but always been negative for GD.
U just have to prick yourself with the needle to check your sugar levels it’s quite easy
If you have it you will get called in to get a testing kit and they will go through everything with you. You will see a nutritionist as well. Depending on how sever yours is you will either manage with a restricted diet, be given tablets, if it’s sever then injections of insulin. I have it bad (I’m on 4 x injections of insulin a day and tablets) it’s overwhelming to start with but you’ll get used to what you can and can’t eat etc.
Your be put on tablets if not insulin and the diabetic nurse will go through everything u need to know like wat foods to eat and wat u cant & if u put on insulin like i was they will also tell u how many units to give ur self day and night aswel as wat foods to eat ect hope that helps x