Hi, I Did Not Have My Periods In Oct, It

Hi, I did not have my periods in Oct, it was due in third week of Oct.. what I observed was a little spotting on 20th and it lasted for two days, then again there was nothing for 5 days, then again there was little as in very little spotting on 28th till date. I did a hpt using velocit but it was negative. In sept also, there was spotting started on 14th but it was more in quantity and continued for 7 days and then the normal periods began from 21-22 Sept..