blood sugar question.

quick question. my OB tested and found sugar in my urine, so today i went and bought a blood sugar tester and took it at 3.30pm after drinking a slushie and it was 3.7mmol/l. after that i ate a yogurt of 100g, pasta and meat, and had a cold drink. i tested at 4.10pm and it is 7.8mmol/l. would you concidered it to be concerning. or is it fine?? im goinging for a glucose test tomorrow where i have to fast... not going to be fun at all