problem which will resolve on its own, or some type of
change that will persist. Something as simple as extra stress
can cause an unusual cycle. Firstly, I ALWAYS recommend a pregnancy test.
The other thing I would probably test for is a bladder infection. One thing to try--Ibuprofen or Aleve taken around the clock can reduce both pain and bleeding. If you were my patient, I would probably try that to get you through this cycle, and then wait to see if it happened again.
Hope this helps!