I recently stopped the birth control pill, and i have had withdrawal bleeding for 4 days. when can i expect that to stop, and when should i ovulate?

Hard to predict: A lot of things go in to your body determining when things happen. When you stop treatment, when things go "back to normal" varies depending on things like how long you were on that therapy, your general health, involvement of other medical conditions you may have - the list goes on. You could expect the bleeding to stop in days or weeks. You could ovulate today or months from now. Time will tell.