I have read your concern.Karvol
which is a decongestant used in cold
,nasal blockade as such will not cause any side effect if used during pregnancy
But,the medicament is only for inhalation.
It should not be poured directly into Mouth or nose.
In your case,chances of the side effect of drug on Foetus is very less.
But make sure that you had taken medical supervision before administering such drugs.
Hope this helps.