Normal blood sugar levels are between 60 and 130 for a pregnant woman...
as far as what you should eat? If you're trying to simulate the actual glucose test you'll be given it's a pretty hefty dose of sugar at once. It depends on which hcp you talk to, some have no problem with having a pregnant mama ingest that amount of sugar and others say no way. It is a highly controversial test considering the amount of sugar verses the amount of time one is given to metabolize it- doing nothing but sitting down. You can google and find lots of info on the web about that in general but I digress.
To test at home I would say eat like you normally would. That will tell you the truth about how you're handling sugar imho
