Pregnancy or period ???

I started cramping yesterday all day and my boobs have been sore for over a week now. According to tracker, my period isn't due until the end of next week. Sense of smell is also increasing. I don't want to get my hopes up but since my fiancé and I always use the pull out method I know the possibility is still there. I'm also curious as to what some of the earliest pregnancy symptoms may be ??