Could i be pregnant?

I haven't has my period this month yet I usually at the end of the month but to my understanding it should've came already because I had cramps a few days ago and I have lower back pain n sore breast . have been feeling like this for like two weeks already. So they say around the days ur getting ur period ur CM is dry well I past the clear sticky the egg white like and the dry now is back on clear n stretchy . what could it be?