Hi Everyone, i have this aswell and it was just a slight niggling on my right side of my pelvis....I had a scan last week and told the nurse whilst she was doing the scan .... She and myDoctor explained to me i have a Corpus Luteum Cyst on my right ovary which explains the nigglng... Mine is not painful.. here is some more info on Corpus Luteum. They are nothing to worry about which is good!

cells in the ovary form a structure called the corpus luteum. The corpus luteum produces progesterone, the hormone that prepares the uterine lining cells for the arrival of the fertilized egg. Every menstruating woman, every month, forms a corpus luteum. However, cells can produce fluid within the corpus luteum and form a cyst. While a corpus luteum cyst is usually no larger than a small marble, sometimes so much fluid is produced that a cyst of a few inches results. The good news is that, like follicular cysts, practically all corpus luteum cysts will go away by themselves in a few weeks. Follicular cysts and corpus luteum cysts are collectively referred to as functional cysts