25 years old and on the last four pills of lo loestrin fe. have had my period for 13 days. when will it stop or how can i stop it?

Not normal, see Dr.: Generally, if you are taking your pills every day, your natural hormones are blocked. The last week of pills has no hormones, which triggers a period. If you started bleeding in the middle of your pills, the dosage may need to be adjusted to be right for your body. Stop your pills, use precautions to avoid pregnancy (foam & condoms), and see your gynecologist. Good luck!