Period.

Okay so I'm on the fourth day of my period right now, my period is normally 7 days. The first two days my blood flow was normal and the past two days I haven't been bleeding really at all. I've been barely even spotting. I'm on the pill. This has never happened since I've started this pill, it's helped shorten my period down to seven days considering it used to be two weeks. But this is very unusual for me. Can anyone help me out?