My period is due in 5 days but i am spotting about 8-9 days after ovulating. what is going on?

Several possibilitie: S. Depending on whether you are trying to conceive, some women experience what's known as implantation spotting around this time in their cycle. That being said, it is also very likely that this could be just an irregular cycle with a shorter than normal luteal phase, which can happen on occasion even to women with regular cycles. Talk with your doctor about any concerns you may have.

Breakthrough: More likely breakthrough bleeding if your period is expected in 4 days.

Irergular periods : Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. There are many options available to help regulate the menstrual cycle. Schedule a visit.