I need your input!

So I was supposed to start my period today. Usually my period starts in the morning when I first pee. My period didn’t come this morning but I’m experiencing mild cramps in my right ovary and a white discharge for the past day and all day today. My lower back hurts as well. But no period. Has anyone else experienced this? If so, what was the cause? This is unusual for me. And yes, I am sexually active.