Spotting and then nothing help!

I had this discharge 4 days before my expected period. I had extreme cramping on just the left side. It felt like it was in my ovaries and was making me sweat. I thought I had a ruptured ovarian cyst but now my period is late. My last few periods have been early due to an irregular cycle caused by a plan b I took in December. Has anyone had anything like this? Hoping my period comes within the next few days