D&c 2 wks ago have low back pain, tender abdomen, urgency urinating. dipstick came back positive low white blood cells, could it be pid or just uti?

Sounds like bladder: It sounds like a bladder infection. PID is not that common after a routine D and C unless STDs such as gonorrhea and chlamydia were present and untreated before the surgery. If you had a urine dip test done then it seems you have seen a doctor for evaluation. Schedule follow up with that doctor for clarification on your diagnosis and treatment