I would check with midwife. Could be a sign of labor.
Any pain when you pee needs to be checked out. Could be infection and needs to be treated before the baby comes. Call your doctor.
hard call to make could be begainings of labor or could be a uti, best to call your dr and get looked at, and maybe take a urin test.
I absolutely agree it should be checked out. As NatFox said, you do need to ensure this is not a UTI.
As for labor, if you are 3 cm dilated, it could be any day or any minute! Congrats to you and I wish you an easy and healthy delivery.