I had a Corpus Luteum Cyst appear on my 5.5 week scan. It had shrunk by my 12 week scan. This particular cyst "occurs after an egg has been released from a follicle. After this happens, the follicle becomes what is known as a corpus luteum. If a pregnancy doesn't occur, the corpus luteum usually breaks down and disappears. It may, however, fill with fluid or blood and stay on the ovary. Usually, this cyst is on only 1 side and produces no symptoms".

I too was shocked as I had never had a cyst, when I read my ultrasound report however the dr has never mentioned it to me so it musnt be much of a fuss in my case.

I wouldn't be too worried about it. You have more scans in pregnancy yet, and they will be able to compare it then. Goodluck Jac