I started Metformin, is my blood sugar suppose to be lower by now? What else should i expect on this medication?

So I've been taking Metformin for 6 days now (taking 1 500mg a day and then i have to take 2 500mg a day starting saturday), and I just had a question. Is my blood sugar suppose to be lower by now or do i have to wait a bit longer? Right now in the mornings before eating my blood sugar is 16 mmol/L, is it suppose to be lower by now?