Ovarian cysts are commonly found in pregnancy and usually left alone until after you've delivered. They sometimes become quite big because of the extra hormones of pregnancy and can shrink afterwards. It is really rare for the cyst to be malignant or harmful to you in any way whilst you are pregnant but, if they do suspect that the cyst may cause harm then they will remove it. Thousands of women have ovarian cysts and have absolutely no knowledge of them until they get very big (my mates mum had one the size of a melon), or they start to cause pain, or they have a scan for another reason (pregnancy usually).
My advice would be not to worry about it, it is very common.
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