Is heavy period with large clots normal? Normally I am on time only 5 days, but yes heavy. I am going on day 8 with large clots, abnormal for me.

Yes. Unfortunately, yes it is common , especially as you get closer to menopause. That does not mean it should be ignored--it could be dangerous, you could become deathly anemic. There are treatments. You should see a gynecologist and take an iron supplement.