I Have A Pain, Not Sharp But Noticeable, On The

I have a pain, not sharp but noticeable, on the top of that heavy pelvic bone that's about halfway between one's navel and one's genitals. I brought it up to my doctor and he felt it but didn't have anything to say about it and he seemed like he was stumped. I'm male, 63 years old, and I brought it up to him because I thought it might be related to my benign prostatatis, even though it does not change with urination. It feels like the kind of pain you would have after doing too many sit-ups, but I don't do them.