How long does breakthrough bleeding last? i've been bleeding for a week now and my period isn't expected until the weekend. i'm currently on lo loestr

Depends : How long breakthrough bleeding lasts depends on the cause. If it is caused by taking a pill late or missing one, it should be better with the next package. If it is caused by an infection, it will last until the infection is treated and clears up. If it is due to DepoProvera, it can be several months or, occasionally, it may not stop until you change contraceptive methods. Hope this helps.