It is possible that your hormone levels of estrogen has lowered and the Provera is not able to make the lining shed because the lining isn't being built up by the lower estrogen levels. At some point, you will need both estrogen and
progesterone in order to have a period. You can ask your doctor to check these two hormone levels after you have been off all hormones for a few weeks. If both are low, you will need to take both in order to have a period. It is also possible that your hormone levels are fluctuating quite widely and next month, it will cause you to have a bleed and you will stop spotting again.
Machelle Seibel, MD