The possibilities in the current scenario are the onset of a natural period or breakthrough bleeding
due to the hormone medication if the dosage is insufficient. You may either see a period further on or this spotting may subside as you increase the dose of the hormone. Yet, taking the medication for just two days, especially when you are overdue, only induces such disturbances and does not delay the period. To delay a period, medication needs to be taken well ahead. Hope this helps.