Extra long

My period normally last for a 4-5 days the last 2 months it’s been extra long. I’m talking about 15 days long. My period has become extra heavy and there is always large clots coming out of me. Has this ever happened to anyone?is this even normal? After my period is over I still have to wear a pad because my discharge has became so intense. It’s very watery and yellow it has no smell.