UTI and antibiotics?

[joralyd]

I was just diagnosed with a bladder infection taken from a urin sample, although I have no symptoms. My OB has given me a prescription for MACRODANTIN (an antibiotic) but I was just reading the side effects and warnings which they give you at the chemist, firstly it says you must not take it if "your pregnant and close to birth" it also warns precaution if you 1. Have diabetes (I have GD) 2. Have anaemia (which I have) PLUS the side effects listed are really quiet worrying!
Nausea and vomiting
diarrhoea
headache and dizziness
drowsiness and altered mood
feeling week
swelling of the face, lips and throat
numbness and tingling
confussion
fever chills
skin rash

Has anyone else taken MACRODANTIN while pregnant??
Am I being over paranoid? The chemist said it was ranked A or B?? meaning safe for pregnancy but this list really freaks me out
Is there something less invasive I can take??