Large blood clots during my period, help?

4 days ago, i wore a pantyliner and saw spots of blood on it so i guessed maybe my period is starting then i changed and put on sanitary napkin but the later that day i still havent gotten my period, i got worried.. but yesterday, i saw spots of blood again and wore a sanitary napkin. later that day, i could feel the blood coming out from me, but i noticed something unusual, i woke up this morning and my pants were so wet with blood and everytime i go for a leak i could see large blood globs on my sanitary napkin and can feel them coming out of me as i pee. it continued until this morning and i have already changed 8x half the day and blood globs are still coming out everytime i pee. what is this? is this normal?