hi daisyduke, i googled and found this answer. i wouldnt worry too much as they tell you to avoid all sorts of things in pregnancy when our mothers and grandmothers would have used them without even knowing there might be a problem. xx
Q Can Olbas oil or Vicks be used in pregnancy?
A Certain oils should be avoided in pregnancy, and this applies to all three of the oils in these decongestants (juniper oil, eucalyptus oil, and oil of pine needles). The fact is that all we know is that these oils may cause problems during pregnancy, and we don't know to what extent they could be used without causing problems. Obviously using a few drops on a tissue would be less likely to cause problems than having a full body massage with the oil, or using it regularly for inhalation. The safest thing to do is to avoid these oils completely in pregnancy.