I have severe abdominal&lower back pains 2 days after menstrual. wnt to er and say nothing wrg. now im cloting

for last 3 months during menstrual i have unusual clotting. after last menstrual (2days) ive had presistent lower abdominal and back pains. went to er had pelvic and sonogram, was told nothing wrong. i have fibroids but they never bothered me. now im bleeding and ping clots and i just finished my menstrual 6 days ago. should i go back to er? pain is still there too. could i have unknowingly had a miscarriage and in need of a dnc?