Is this pain a constant pain or something that increases with activity? Or do you notice it more after you have been on your feet and are resting?

I'm thinking that you have some sort of pulled tendon or ligament since I had this same pain when I was pregnant. It was from my pelvic bone to the groin and it was excruciating. The reason why I got it was from the weight I was carrying with the pregnancy, plus the shape my back (I have a weak and problematic back) was in was not strong enough to be able to support was going on on the front. Things like this can take months to heal once the cause is removed.

I am wondering if you are carrying any excess weight in your frontal region?

....I could be wrong, but it does sound like joint/ligament, no matter what the cause.