Pre ovulation bleeding??

is it normal to get pre ovulation spotting?? Done an ovulation test this morning and it was negative, then done two clear blue ovulation digital test at night and they were ‘not fertile’. Cause when I was at work I went to the toilet and wiped and there was very light pink spots, then again when I went to the toilet there was some on my underwear but not much again, so therefore I done the two clear blue digital test once I got home!? Is it normal to spot before ovulation?? I am in my fertile window at the moment! A bit confused as to what’s going on??.