I started my period on Wednesday January 31st, ended on Wednesday February 7th. My fertile week lasted from Thursday February 8th until today the 13th. I had sex everyday of my fertile week and I have had very light pink blood when I wipe since sunday and today I noticed very light brown blood in my underwear and on the tissue. Could I possibly be pregnant? and how long should I wait to test? My next AF is due on February 24th!