Should I make a DR appointment ? (TW: Miscarriage)

I had a miscarriage over 3 months ago and thought I had a period about 3 weeks ago because I spotted for almost a week. For the past few days, when I would go to the bathroom, I would feel like something was stuck, similar to when tissue would slowly pass during my mc. Early in the day, I felt a random urge to pee and I ended up passing a piece of tissue. But I’m confused because my levels went back down a while ago and I got an U/S and they said everything passed. Has anyone else had this happen? Is it possible there’s still remnants?