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Some women do not experience labour pain. Labour pain may be delayed if the Last Menstrual period is wrong or you conceived much later. Only thing which can help to take decision is the latest Negative pregnancy
test and earliest Positive pregnancy test and earliest sonography
study. If these are not available then it is the clinical assessment which has to be relied on.
As for tips to get pain naturally, do daily casual walking, morning and evening for one hour, do light jobs in the house, drink plenty of water, eat lots of green fresh vegetables.