I tested positive for strep b as well, so had IV antibiotics during labor. My son was born three weeks early (my water broke at home, I wasn't induced). I did not have UC prior to having my son and my symptoms started about 4 weeks after giving birth. I don't think it had to do with the antibiotics, though, but rather the hormonal wackiness that happens after birth.
At any rate, I hope you find something that will protect the baby yet be as easy as possible on your gut.
Does anyone know if it's better, in terms of gut health, to have an IV antibiotic versus and oral one? I mean, it seems that since the antibiotic isn't going in your GI tract it might not kill off as many of those bacteria.
Status: Remission since late May 2009!
Symptoms began in November 2008, ~4 weeks after giving birth to my son.
Eased for ~3 weeks in December, possibly b/c of probiotic use?
Returned in January 2009 (with a vengeance), diagnosed with pancolitis on January 30.
Currently taking Asacol (400mg 4 pills 3x daily), Rowasa twice weekly, Culturelle probiotic, and Zoloft (25 mg).