Hi M.,
Here's a link to an article for you on the use of Ciproflaxin by pregnant women:
Ciprofloxacin (CIPRO ): Use by pregnant & lactating women
If the link doesn't come through when I send this, here's the web address you can type in to take you to it:
http://www.fda.gov/cder/drug/infopage/cipro/cipropreg.htm
From what I gathered, it hasn't actually ben tested in pregnant and lactating women, but is often prescribed when the situatin warrants it... seems to be considered "safe enough" if there's a need for the mom to have a strong antibiotic (it's chosen over others). It says that, although they cannot say it poses NO risk, it is unlikely to pose a substantial risk.
Punch in "cipro effects on pregnancy" to your google and it will generate several other articles as well.
I've had friends on strong antibiotics within the first trimester (about 3 of them) and all the pg's and babies came out fine (one mom had nasty, nasty morningsickness -morning, noon, and night all 3 trimesters- but that was not related to her antibiotic use in early pg and is, unfortunately, what her pg's are like). That isn't a case study or scientific data, but I hope it helps to hear that there are other moms who had no ill-effects (one or even all of them may have been on cipro itself, but I don't know the names of their antibiotics, only that they were "the big stuff" like cipro is and same trimester as you).
Congratulations on your pg, btw. Had your kidney infection NOT been healed, I think you and your baby would be in some real danger. Maybe the cipro is the thing that made it all okay and saved the baby from danger... although I understand and empathize fully with your fears and worry.
Take care and God bless.