I have the same thing at the moment, I went to the hospital for my antenatal thing and they told me to get otrivin which contains the same active ingredient, it is ok to use in pregnancy.
I have also been using narium (samr as fess)during the day and only one spray of otivin in each nostril at night so I can sleep.
cat c drugs are still ok to use as long as for short periods, just means that the drug in question may have caused abnormalities in animal studies.
hope you are feeling better soon.
xxx