I cant tell you much from personal experience, but I did come accross it on the net when trying to find some information about something else. From what I understood, not long after you conceive your body starts producing a hormone called 'relaxin' to soften all your joints, ligaments and muscles for birth. There is a small joint which joins both sides of your pelvis in the middle and under the 'relaxin' hormone this joint loosens to allow your pelvis and hip joints to move and spread easier but in the process for some women this joint in the centre gets irritated and inflamed. It causes a lot of pain (groin and pubic region). It says it is usually worse at night and may cause sleeping problems. I cant tell you much more, but there are a lot of good sites about it on the net that also have recomended stretching and exercises you can do to help manage it. Good luck!
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