Noroxin in Pregancy

Patient: I live in Spain and have a urinary tract infection caused by Klebsiella. I am 13 weeks, 4 days pregnant.I was first prescribed Monurol which did not work.The doctor is now prescribing Noroxin 1 pill a day and night for 7 days. I do not know the dosage until I pick up the prescription (it is only in one dosage in Spain).Is this safe to take during pregnancy?Thank you very much in advance for your help!Kind regards,Marie-Claire