Hi I Normally Have A Regular Cycle Lasting 5 Days

hi i normally have a regular cycle lasting 5 days each time, for the last 8 months i had my period on the 19thof every month , although august 2016 it came on the 19th but it last one day and a half , then september 2016 it was 8 days late and i spotted for 3 days then the following week i had loads of white discharge then slight cramping and a pulling feeling in my lower abdomen what could this mean? i have no health issues and have 3 children , could i be pregnant?