pregnant with bladder infection sucks

Well I went to get my prescription and it says don't take if become pregnant I asked the pharmacy if it was safe they said it's not the one they usually prescribed when pregnant and he advices me to not start it until I talk to MY doctor😡 I'm in so much pain when I empty my bladder it's horrible.😔going to call first thing in the morning and see if I can go into the office and figure this thing out😔 I'm so scared to lose the baby some how because of the pain and everything😔