This roller oil set is perfect for labor. 

Lavender - great for promoting relaxation

Peppermint - great for nausea, and encouraging emptying the bladder. A few drops in the toilet will do the trick. A full bladder can slow labor down.

Clary sage - can help pick up contractions in a slow labor. Can also aid in relaxation. Best if used under the supervision of your dr or midwife. Not advised to be used before 39 weeks of pregnancy.