There are not many oral options that work for pseudo according to my doctor. This could be in relation to my specific case...although I'm not pan resistant and I only culture pseudo so one's case can't get much simpler. I recall maybe Kephlex (sp?) It was a 'relative' of Cipro that was 'safer' during pregnancy. There are a host of IV antibiotics.
I am on TOBI and Bactrim prophalactically. I don't believe Bactrim treats pseudo but it treats lots of other bugs and seems to keep me out of trouble in the dirty city. Bactrim is used often in the general population during 1st and 2nd trimester to treat urinary track infections (or maybe it was vaginal?).
Of course, every drug used during pregnancy carries risks. The drugs I use during pregnancy have been weighed against the potential benefit and the benefit weighed out on top.
If I have a full blown lung infection that's headed towards pneumonia of my upper right lobe during pregnancy I will likely not mess with any oral anti's and head straight for IV. The reason for this is the oral I usually use, Cipro, can't be used. So whatever they would give me would be new to me and we'd run the chance that it would have no effect and then I'd be put on IVs which I could be wrong about but there are some 'safe' options. So if there's a good chance I'd be on IV eventually, I'd rather save lung capacity and head towards proper treatment faster.
That's my 2 cents.
For the record, I hope to not go on on IVs during pregnancy but if it's better for my health and the baby I will.
Good luck boxer - take care and keep us posted.