What Causes Delayed Period, Sore Breasts, Headaches And Nausea?

I am 23 years old for the past 3 weeks i have had sore breasts and I can also feel big clumps in breasts which hurt really bad. i have also been experiencing horrible nausea all day every day and terrible headaches. The first day of my last period was 02/11, I have not yet to start my cycle yet this month. I also have a white discharge.