Why is my period taking so long to happen?

LSXO

My periods are irregular most of the times. However, just recently, i’ve been experiencing a lot of symptoms such as, back pain, being sensitive, moody at times breast pain, and getting really horny (which i usually experience normally before my period) I have like 3 days until the next month. I’ve never had sex and i don’t take birth control. Could this just be that my periods are irregular or...?