IS IT A CHANGE OF CYCLE?

Hi, last month i dd not feel any symptoms of my menstruation but it came in the expectd date, but i dnt know if that is spotting or blood because at first, second, third day my undie has a small blood like spotting, then the 4th, 5th, 6th days the blood became medium, the month of sept. I am sexually active. and this month I still waiting for the period to come and my expcted date is on oct. 24 but i ddnt feel any symtpoms of menstruation. Is this what we call our cycle is changing?