Could Delayed Period And Vaginal Spotting After Having Protected Sex Indicate Pregnancy?

Hi, I m very worried as I am four days late on my period. I did get a small amount of blood when my period was due and then through out the day it went fading to light pink. Now, I m having alot of white discharge sometimes milky and bulky and others very watery. I had protected sex while I was fertile and the day before my period I had sex using the pull out method. Is this happening because I m pregnant?