I was suppose to start my period on the 18th of this month but i didnt and still have not started.ive been having lower back thats bad enough to bother me.and i have had moderate cramping.there was a week i was bloated my breast havent had any change.my eating has changed and ive got diarrhea.and my sleeping is just out of whack some nights i sleep and some nights i just cant.whats going on? I have not taken a pregnancy test.im afraid of the result.i dont want to be disappointed if its negative.but can i be pregnant?