welcome to HCM
is a gram negative oppurtunistic bacteria usually hospital acquired. it is really a serious infection as it may lead to pelvic abscess
and may involve the fetus. the drug you used i.e. ciprofloxacin
have a good action against gram negative bacteria but over a passage of time pseudomonas have developed resistence against quinolones. the culture and sensitivity test you performed might also have shown the drugs sensitive against the pseudomonas species. however third generation cephalosporins have shown good gram negative coverage and studies yet haven't shown any harm to fetus so it can be used in pregnancy
if potential benefits overlaps the side effects. for proper evaluation consult your gynacologist.