No, thyme does not cause contractions. It is sometimes recommended during pregnancy as a natural remedy to help reduce the pain and discomfort of labor, but there is no scientific evidence that it actually induces contractions or speeds up delivery. In fact, while thyme may be used in traditional medicine for many purposes, including labor induction or stimulation due to its antispasmodic properties, this has not been proven in clinical studies so far. Therefore it should never be taken as a substitute for medical advice from your healthcare provider if you are pregnant and concerned about labor contractions.