Could Heavy Clots Along With Severe Abdominal Pain During Menstruation Be Normal?

Hello, I am a 32 year old female. I have had three very large baby s in the past 12 years. With each baby my periods have been getting heavier. Since the last baby 5 years ago I have been having a lot of blood clots. This last period I had many little ones and then four or five very large ones, covering the whole pad. And then a lot of pain the last day or two of my period. Is this normal?