Mommy's that have been pregnant before....!!

So for the last several weeks I've had the worst pain when it comes to emptying my bladder or (tmi) passing gas. It's a sharp pain in my abdomen everyone then after I'm done the pain is gone until I use the bathroom again. Starting today the pain has remained. To the point of it being hard to even lift my right leg or bending to get something. It's a constant pain. It makes it really hard to do my job as i work on the ambulance. Could all of this be related to stretching pains or how he is positioned? Or something else? I try not to blow my doctor up because it usually takes him 24 hours to call back anyways, sometimes longer. (Also the pain is not UTI pain and I drunk plenty of fluids). Thank you for any help! I'm 21 weeks.