Weird heavy period?

I started my period a month ago and it’s been so heavy that I’m soaking pads in an hour big blood clots literally every minute I went to the doctor and he scheduled me for a pelvic scan that’s not until next month should I be worried?? I haven’t been on birth control or anything and I take levothyroxine thyroid medication has anyone experienced this should I wait until my appointment or go to the ER?