Help a girl out!

Alright soo please tell me something. Why does all of a sudden my period want to act up? My periods are usually on time maybe even early and all of a sudden it is late. I have slight cramps not bad at all but you know I can feel them a little. But today I was supposed to start my period and nothing not even a cramp. Last cycle it was late as well but it was because I was stressed about moving. I haven’t been stressed this month though soo I am confused. Help and bitch out haha