I have a constant pain in my right breast. with numbness on the side of it. it started with a dull pain in my back shoulder and magnified after i had a breast ultrasound on past wednesday. should i go to urgent care?

Your symptoms make me think about shingles & neuralgia but rashes should be present on your back-shoulder by now because the pain has begun for more than a week. I wonder what the indication for the breast US. The US procedure is a coincidence, less likely the cause of your breast pain. You should try OTC ibuprofen 200 mg x 2-3 tablets for one day + observation, to urgent care if symptoms persist.