They said mine was small, I can't remember the exact measurements but they told me it goes on the ratio to your placenta. I think at the time mine was around a 1/4?? I had my 12 week scan today and it wasn't even mentioned, I haven't had bleeding for a couple of weeks so perhaps it resolved? In all of the excitement if didnt occur to me until we were back in the car so I never got to ask but I assume she would have noticed and mentioned it of she had seen it to be an issue, as she was poking around and very thorough with the scan.