Questions about blood sugar testing at home.

I started checking my blood sugar at home recently by buying a blood glucose meter. However, after measuring my blood sugar for the first time and thinking it might be accurate, I tried again, but the results from different test kits all came out differently. Is that normal? Even after pricking once and wiping the blood, then re-measuring with the same blood, the results still vary. I don't know which one is my real blood sugar level.