Still bleeding 3 months after D & C

I had a D & C at the end of december because of a missed miscarriage. afterwards I had spotting for a few weeks then it stopped. a few weeks later I had what I thought was my period, but it wasn't as bad as my period normally is. then I didn't bleed for a month, had my period again and though everything was back to normal.

two weeks after my second period since d & c I started spotting again. a little heavier than spotting, not as heavy as my period, this latest 1.5 weeks (long for a period for me). then it stopped for a week, but now it's started up again and has been going on for another week already.

any thoughts?