AF came back???

Su
I got AF last Saturday which was a day late (but I had started taking Vitex so that wasn't completely unexpected to be late). It was a normal period with 2 days of very heavy flow and then two days of medium flow then stopped completely. That is pretty normal for me. I had a whole day and a half of no flow and now I'm spotting very brownish. Not enough to need a pad but it's been there every time I wipe since yesterday afternoon. This has never happened to me before, usually when she's done, she's done. Anyone else experience this or know what this might be all about?