Brown/red discharge

****TM*** Help! Period due in four days. Been trying to conceive for three years and had surgery two months ago to clear my endo and pop a cyst in my ovary. I was told I’ll be fertile for 6 months and to really get down to business and try... now 4 days before period I’ve this... could this be spotting? Been a little off for a week or two as I’ve had some niggly pains in my abdomen... advice ASAP? Could I be preggo? I do apologise about the tmi pic