I need answers!!

I took the plan B pill on June 20(within 24 hours) because I didn't know if my boyfriend pulled out in time or not. I had what it looked like a second period a few days after and I know this is normal. but I was supposed to start my period this week and it hasn't come yet and I'm feeling pregnancy symptoms such as nausea, breast tenderness, headaches, and thick white discharge. is it normal to have these side effects so late?