I recently found out I am pregnant and started bleeding lighter than a period but heavier than spotting and I'm passing tiny bits of tissue, I went to see my doctor and he arranged for me to go for a scan on Monday. He said the term used was a threatened miscarriage in these cases, I've had no pain or cramps however I have passed a rather large clot of tissue just in the last half hour. I'm still in no pain and the bleeding seems to have alien down some what but I was just wondering if there is any thing for me to be worried about with passing this tissue?