I Had Unprotected Sex And Used Nordette As ECP I

I had unprotected sex and used nordette as ECP i followed the 12-hour instructions in drinking it. It has been 12 days since i drank my first dose and I still haven't got my withdrawal bleeding. I have thick white discharge and turns to yellow when dry i've read that it's a sign of early pregnancy. My period is due on the 15nth of the month. Could I possibly be pregnant?