So, I have a bit of a question/concern. My period is pretty much like clockwork with my it lasting for 5 days, and 23 days in between. Usually starts on a Sunday, leaves on a Thursday, sometime in the afternoon. It's Thursday, and I'm bleeding. I'd like to point out that my last one started on the 3rd, and I'm not due until Halloween... but, here we are. I've been on a pretty regular routine for years, starting in my mid teens (I'm 23) with the occasional strenuous exercise induced start up (usually a day before it's due). Should I be concerned about this?