Periods And Pregnancy

Hello, I am 27years old and it's been 1.5 yrs to my marriage. I have always been regular on my periods but this time I had fresh blood on wipe for around 1 - 1.5 day and brown blood on wipe for around 0.5 day. I did my pregnancy home test the very next day but it was negative. Can any Dr tell me if this behavior of periods is normal or I am pregnant. I will certainly get my pregnancy test done next week but I am worried about this change in my periods. Please help Also please note when this period started (on wipe) I was on 32nd day of my cycle and usually my cycle is 28-30 days long.