Was supposed to get my Rhogam shot next week but I have to reschedule and I know not to eat anything…

Was supposed to get my Rhogam shot next week but I have to reschedule and I know not to eat anything too just in case I failed my 1hr glucose and have to take that triple sugar rush...it sure would be nice if they gave you an idea of what all they are going to do each appointment but they just spring it on you so I rather be prepared than not