Are these bleedings considered menses or istihadah (non-menstrual bleeding)?

The maximum duration of menstruation is fifteen days. If the recurring blood, combined with the previous blood and period of purity, exceeds fifteen days, then it is istihadah (non-menstrual vaginal bleeding). You stop praying upon seeing the recurring blood if the total previous purity has not reached fifteen days. If the recurring blood exceeds two days, and the total becomes more than fifteen days, then you are mustahadah (experiencing istihadah); refer to your previous habit, or act according to sound discernment, or consider six or seven days as menstruation. During the period of istihadah, perform ablution for each prayer after its time has begun.