I have my periods on time and even last month it was on time i.e 17 September but suddenly since 6th October I’m again having bleeding though it’s very less but it’s been 3-4 days and bleeding is still continuing. I don’t know why is this happening since my date is on 17 oct. Also I’ve not taken any sort of pills or medicine and there is no way I can be pregnant so I really don't know why is this happening whether it's only period before time thing or some serious health issue...Please tell me what to do.