Periods after D&C

Gouri
I had an ectopic pregnancy last month. Doc did a D&C as well as removed one tube. My period returned 2 days ago and it's so different than before. I have severe cramps, bleeding bright red severely and I have been changing pads every 4-5hrs since Sunday early morning. Should I be concerned? I have already emailed my obgyn. Ladies, please share your experience.