Minor TMI alert, but I reckon on this thread anything pretty much goes. 
About three months ago I had a bright red bleed lasting two days, in the middle of my cycle, following by two weeks of brown staining.
Then nothing for about two weeks, then two days of bright red bleeding again, followed by a day of nothing, then a period lasting 3 days.
This month my period has been the same, two days of bright blood (I'd normally start with brown staining) followed by this time two days of nothing, followed by a normal period.
I'm not freaked out, guessing it's just one of those things (have PCOS), but how do I count my cycle? From the start of the two days of bright blood?