Unsure what's coming...

So, we haven't been trying at all this month. Just took a month off. Usually I have lower back pain right before my cycle starts. I had some cramps in my stomach last night and thought I would be starting this morning. Nothing still but I'm not due to start until Sunday the 28th. I have started early times before as last month I started 4 days early. Not sure what to make of this month.