Hi, I've Had Unprotected Sex On March 20, Which Is

Hi, I've had unprotected sex on March 20, which is expectedly my next period because my last period started Feb. 20, but I still haven't got my period since. I've only been getting thick white discharge after four days now it's just watery. It has been 6 days now, still no period just discharge. I also took ECP two days after sex. Could this be a sign of pregnancy? I would really appreciate a clear answer on this. Thank you.