Symptoms are the most important.
Contractions - regular hardening of the entire womb
Leaking water - when your water bag bursts and you need to get to the hospital
Bleeding - fresh/stale blood
Diminished movements
Braxton Hicks - false contractions
Labour - regular painful contractions leading to dilation of the cervix
Cervix - opening to the womb
Painkillers (Laughing gas/Nitrous oxide) - makes you temporarily high for you to forget the pain
Epidural - administered into a space in the spain to numb the lower half of the body
Station - level of the lowest part of the baby in relation to the mother. If the station is high, it means that the baby is still quite deep in the pelvis. If low, it means delivery might come soon.