What Does Light Blood Spotting 5 Days After Taking Postinor Indicate?

Hi, I'm 25 years i had unprotected sex day 12 and 13 of my 30day mestral cycle n I used postinor two on day 13. And I saw light blood spotting 5days after taking the drug. Now my period is 2 days late and is yet to come as I've menstrated for 30days interval for d past 4 month. Am I pregnant or my period will still come. And d blood spottin I saw is it, widrawal bleeding or implatation bleeding