A corpus luteal cysts is usually not a cause for concern nor does it usually adversely effect the pregnancy or cause miscarriage. Sometimes you may experience a bit of pain or tenderness. Your doctor or midwife may prescribe pelvic rest or pain medications. The most frequent scenario is that the cyst will resolve on its own. Occasionally the cyst will rupture causing pain and even less likely, the cyst could cause the ovary to twist and potentially require surgery.
Obstetrics: Normal and Problem Pregnancies. Gabbe, S, Niebyl, J, Simpson, JL. Sixth Edition.