Still bleeding

Jessie

I have been on my period since last month on the 17 and I am still bleeding till today non stop and at one point it looked like it was going to stop but then it got all heavy again. I am on my third bag of pads. Should I be concerned about it and I have an follow up OBGYN appointment on my husband's birthday at 10am. I have been having lower back pain in the middle since yesterday and I have been having stabbing pain since I woke up today.