Am I Diabetic or Did I Just Eat Too Much Sugar?

My friend checked my blood sugar with an Acucheck and got a reading of 220. I know this is high but I'm wondering if it could be a result of what I ate today. Throughout the day I had chocolate doughnuts, M&Ms, a pepsi, tea with sugar, a bologna and cheese sandwhich,and goldfish crackers. When my friend tested my blood sugar I had literally just finished swallowing my dinner of a burger and potato salad. This diet was completely made up of sugar and carbs...horrendous, I know. Could this account for the high reading? She also didn't swab my finger with an alcohol pad before pricking my finger which makes me suspect her method could also be a little suspect. At any rate...should I be concerned? No matter the answers I recieve I'm going to get an actual test done to put any lingering worries to rest...I really just wanted some opinions.