Passing tissue

So I’ve been in bed the last 3 days with what I thought was a super heavy period. I was filling up a tampon every 30 mins. I called my Dr and she called me in a prescription to stop my period. I never ended up taking them because by the time they filled it I was slowing down on bleeding. Today I started having some intense cramps, when I wiped I noticed some flesh colored tissue. Could this be a possible miscarriage? My dr is only on emergency lines as of this afternoon for the weekend. I’m not sure what to do.