Is it spotting or actual bleeding?
Is it possible that you're pregnant? During pregnancy it is possible to spot a little or even have period like bleeding. Or are you on a low hormone birth control? Sometimes a lower hormone bc can cause spotting in between periods. Either way it's unusual and you probably should see a doctor. If you aren't pregnant you really shouldn't be spotting in between periods or missing them. If you are pregnant, you really shouldn't be spotting at all.