That I have a UTI? Dont you get symptoms?

The last time I had one I certainly knew about it... Pain, blood, etc... but I have nothing atm that I know of.

I just had a call from my OBs office to say I have one, and need antibiotics for it...

Is there any harm to the baby considering I am still early days? I have antibiotics for it (keflex) which I think are cat B so ok, and I assume better to take to kill the virus?

And anything I can do to prevent another????

TIA!