Cramping

So my period is really off because I usually spot a couple days before actually bleeding. I have two apps to help me keep track of my periods and apparently I'm not suppose to have mines until next week or tips the end of next week, but right now I'm feeling light cramping like how I would feel if I'm on my period. Is this normal ? I would seriously hate if it was my period coming early but I don't feel this pain until I'm actually on my period.