My last pregnancy was not a good one, there were issues and there was a tear at the placenta. I had bleeding and went to the er. The er ultrasound tech was NOT gentle and I was squirming all over the table in pain. While I don't think tau cause miscarriages, I can see where that kind of thing that happened to me could expedite a pending one, and may be where the stats came from. I bled quite a bit after that exam if I remember. Correctly, and did miscarry. She was ROUGH. And in a delicate pregnancy that wasn't good