What Causes Itching And Smelly White Vaginal Discharge?

I took Plan B just to be on the safe side and then 5 days later had unprotected sex and took Plan B again. I have a period tracker and it showed me that I am going to ovulate 2 days later. It s been 3 days now since the last time I took Plan B and I ve been really itchy down there and I have been having smelly white/pinkish discharge. Is there any way I could be pregnant?