I'd talk to a pharmacist as well - don't take our advice as solid medical opinion because very few of us have any kind of medical background.
But, I've worked in the pharmaceutical industry for more than a decade and took Levaquin for almost 4 months during chemo because I had no immune system of my own.
At month 3.5, I began to have issues with tendonitis. I can't imagine any reason you would be on the antibiotic that long - chances are you'll be prescribed a 5-10 day course of therapy.
Levaquin is not penicillin-based. It's a different kind of anti-biotic that is very strong and should take care of your bacterial infection effectively and quickly.
The FDA requires pharmaceutical companies disclose all side effects that occur in more than 2% of the population during clinical trials and once it's available to the general public. You don't know the conditions or medical records of the people who experienced those side effects.
I'm sure your physician wouldn't prescribe anything that would do you or your unborn baby any harm.
But, please speak with a pharmacist or two to get their opinions as well as they're more trained on the drugs and the pharmacology.
Good luck and I hope you get to feeling better soon.