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First thing is sure you are not pregnant. 2nd thing the present symptom is severe abdominal pain
with absence of menses. In our case sonography
report is must. these two symptoms may or may not be related with each other. there are many other causes of abd pain like some gastroenteritis( usually with altered stool), stone problem, appendicitis
, any sort of infection and many more. and another thing is your family history suggests the need of sonography. No need to worry for cancer !!
I hope I have answered your question. Wish you good health.