Thanks for the query.
If the pregnancy tests are negative and in case you have regular cycles., it rules out a possibility of pregnancy.
The reason for the feeling in your tummy could be due to Infection, vaginal or abdominal or any hormones.
Consult a gynecologist for an examination. A urine infection also has to be ruled out which could be a possibility.
Drink plenty of fluids orally.
Hope this helps.
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