Severe contractions but not dilated.

See the pattern of your contraction. If the contraction duration is around every 10-5 minutes and each last for 1 min consistently (you even dont want to/cant talk anymore , go hospital immediately. But if the contraction didnt show obvious pattern, like random timing, that could be braxton hicks aka fake contraction. Try to hydrate, walk more if you have been sitting long. Fake contraction usually by doing all of these, will go away. But if the contraction persists, then your labour is coming soon.