I was week late for my period today I had a lot of grey mucus red/black clot is that a miscarriage?

Well if it is you would be bleeding i would call your dr or go to the er and let them know what is going on just in case i hear heavy periods are like that .Possible the way things look mabe a first time period have you had any cramps?could become painful get it checked out do a clear blue easy pregnancy test..