I need help!

Sierra • I`m 21, Married on June 6th 2015. We`re trying for a baby!
So..I havent had a period for months, my breasts have started to be rather sore for days, my stomach seems to bloated all the time, I have felt nauseas at times...yet everytime I take a pregnancy test it comes back negative! Does anyone else know what could possibly be going on?