It depends whether your cycle is very regular. I have a very regular cycle and on the day I missed period, I already see a clear positive using clear blue digital. 3 days prior to missing period, I use hcg strip and also see faint red line . But I think the best is wait for 1 week.
2 days late is still early. Advisable to wait a week. I waited till the 7th day and it's a clear positive. And I tried again on the 10th day using Clearblue digital and got a '1-2weeks' result.