A few months ago I started to feel weird twinges in my lower pelvis. I have had several ultrasounds and blood tests (all clear). The pain has now progressed to a constant throbbing that radiates through my hips and lower back. Also, my pelvic bone feels bruised to the touch. I have searched the internet for possible causes, but all I am seeing is that this is commonly a phenomenon experienced by pregnant women. I am 23 and have never been pregnant or had past health issues. Has anyone else experienced this?