My gf had been diagnosed with a severe uti and bladder infection. she has lower back pain and tender breast, are these from the uti or is she pregnant?

Bladder infection: May cause lower back pain but not tender breasts. The best plan is to obtain a pregnancy test, which already may have been done. Antibiotic choice will be made on the basis of her pregnancy status. All the best.

Do pregnancy test: Urinary tract infection will not cause breast tenderness. If she missed her period or you suspect she may be pregnant.do a in home pregnancy test. She will need treatment for UTI with sporopriate antibiotics