Plan B - PLEASE HELP

Back in October I️ had unprotected sex and had a pregnancy scare so I️ took the plan B pill within the next 24 hours.

After 15 days of being late, I️ took a pregnancy test which indicated it was negative.

I was about 28 days late on my period, but I️ suddenly started spotting. Spotting turned into a heavy period with continuous blood clots and severe pack pain. 11 days later I’m still bleeding super heavy. Should I️ be concerned? Is this normal? Possible miscarriage?