spotting hit and miss all month

So just about the time I think I figured out when I ovulate af screws me up again. I thought I was having ovulation spotting since the last 2 cycles when I spotted I got positive opk. but this cycle is not following that. I have spotted hit and miss 5 times this cycle. and by spotting I mean a streak of blood when I wipe and nothing else all day. and the days I've spotted haven't even been together!! they have literally been scattered thru my cycle! what is happening !!!?