Hi I am 24 yr old, I have been experiencing pains in both breast as if full of milk, they are bigger then before, also this month my period was late and only 2 days long, when it is never late and always 4-5 days long. I have been nauseated a lot and experiencing frequency in urination as well as slight headaches . Iv been very tired and moody. I took a home pregnancy test and it came out negative. What could be wrong with me?