period after m/c or left over tissue?

Alexandria • Wife 7/3/11💍 Mommy to Mila 2/20/19 👧🏻 + Eleanor 11/23/21 👶🏻
On oct 29 I had heavy bleeding and a week after the bleeding stopped I started spotting so I took a hpt and I got 13 positive tests last week. My doctor said that the bleeding before could have been a miscarriage since I was still spotting, so I went in for a blood test on Monday and it came back negative.. we were devastated! Anyways I started spotting last night and today it is now getting heavier, bright red. Is this my first period after my miscarriage or it is still left over from the miscarriage? And is it okay to use tampons if it gets heavier if it's not my period? This was the first time I have ever been pregnant so I have no idea about any of this!