Thank you for writing in today.
Generally, with a groin pain, there is a specific event that percipitates the complaint, or sometimes there are associated symptoms, such as swelling, redness, etc.. Since your pain is generalized without any associated symptoms or history of precipitating event, such as exercise, I would recommend evaluation by your provider.
There are many things that could cause pain in this area. Obviously, bone or joint disorders, such as arthritis could cause this pain. However, less obvious conditions should be considered. These less obvious conditions can include ovarian, kidney, or bowel problems that can cause referred pain. In particular, ovulating women do often report some groin discomfort during ovulation.
At this point, I would recommend your GP. You will need a complete physical exam, focusing on range of motion of your joints, sensation, reflexes, and strength of the legs. You will also likely need a comprehensive assessment, particularly of the abdominal area. When you do see your provider, provide a detailed gyn history, including date of last menstrual period.
I hope this helps. If you have additional questions, concerns, or would like to discuss this further, please let me know.