I would think it's still part of the miscarriage. It's good to have a follow up with the doctor too, just to make sure that everything passed. I'm really sorry too, that you are going thru this.
Have you had your miscarriage confirmed? If so it will just be part of the miscarriage, some women can have abit of stop/start bleeding for a little bit after a miscarriage, if it hasnt been confirmed I would go and have either an u/s or get your hcg levels checked, to make sure they're going down