Paranoid period question.

Katie
I get very paranoid when my period is late and for the passed couple of months my period seems a little off. For the longest I've been getting my period on the 3rd every month. It lasts for 6 days, but in September i got it two days late, on the 5th but lasted the usual 6 days. In October it was on the 6th but only lasted four days, and was mostly a brown color. I've always gotten cramps before I got my period, and until after the first day. I haven't gotten my period yet today, but I normally have a 30 day cycle. For these passed two months I've had spotting after my period was done. Sometimes it would be on my panties and sometimes only when I wiped. In auguest i got it two days after my period was done and had spotting for three day in scepter it was the day after my period and was only two days. Could this be stress related? Or my period just changing? Has anyone went through this before? What was it? Please help, I get very paranoid about this.