:'( I'm 20 yrs old and I'm experiencing the worst period ever! My period usually lasts for about 3-4 days but for some reason my period does not want to leave. I've been on my period for 7 days now and I'm experiencing heavy bleeding, abnormal sized blood clots, and really bad abdominal cramps. I have a dr.'s appt. tomorrow and hopefully he can help, but what I'd like to know is how can a normal period just up and change all of a sudden and is that normal?