Hello, Let Me Start By Telling You My Story. My

Hello, let me start by telling you my story. My husband and I had sex September 24, 2015 my period came September 27, 2015 (3 days later). I have not had sex with my husband since that day or any time of sexual anything. My periods are 28-30 days and appear every month. If my calculations are corrct my period was suppose to come yesterday October 22, 2015. It has not happened and I am having a series of spotting on my under wear. I have never had this type of spotting. It has a redish pink consistency and soemtimes brown. My spotting is normally brown and it occurs the days I am fertile and ovulating not the days of my periods. Would you say I may be pregnant? Can I take a test? Should I wait til the end of the month?