Gestational Diabetes test on Monday...

Have to take my 1 hour GD test Monday morning. This is my first pregnancy so this makes me neevous. My OB diagnosed me with Insulin Resistance a while back and just put me on a diet to help with it. Also have low vitamin D so she has me on vitamins for that. So far throughout my pregnancy I haven’t had any problems. They’ve run tests on me before for other things and everything came out perfect but this test just bothers me. I just feel like if I fail I’ve just done something wrong and worried that something could happen to our baby.