Most women don't have to report to the hospital immediately at the start of labor. If there are no complications and the pregnancy has been normal and uneventful, mom can stay at home and take a shower before heading to the hospital. Contact your obstetrician at the start of labor for detailed instructions. Many doctors will tell you to wait until contractions are a certain distance apart before heading to the hospital to reduce your time there.
If you're already in the hospital in labor you may still have the opportunity to take a shower. Talk with your doctor or nurse to see if a shower is available. Warm showers can ease pain and relax muscles during labor, which may have a positive impact on progression and the overall birthing experience.