Started new pill prescription (changed brands/doses) and now bleeding for 2 weeks of the month. been happening 2 months in a row.

One more month: If after another month of this pill you are still having the prolonged bleeding then you need a different pill. The pills generally have estrogens and progesterone, and when the balance and amount of each is right for you, the monthly period is light, 5-7 days, and normal. See your doctor if this doesn't settle down after one more cycle.