Feeling pain down there...

I'm 26 weeks pregnant...about a week ago. Began to notice this pain down there. Not sure how to explain it...feels like my pelvic bone maybe? As the day pogresses it feels more and more uncomfortable and I find myself waddling. I don't have cramps/ contractions or any kind of discharge which is a good sign I hope...just wondering if any of you might know what it is and if I should worry...I go to my specialist tomorrow so I'll know what's going on then.