AF can't make up her mind!

About 8 DPO-14DPO I was experiencing symptoms like nausea, horrible acid reflux, and some mild cramping. I got a BFN 12 DPO. Symptoms have since subsided and I was due for AF on the 27th. I had nothing until the 30th. Finally AF came that evening, but very light. By the next morning it had stopped. I had  light flow again early this morning, and now nothing at all. Has anyone experienced anything like this before? I'm so frustrated! AF come or don't! I want to get on with TTC!!