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As u told your last menstrual period was on feb 11 that means even if your cycles are of 35 days you have crossed your dates by 10 days.. Now you should do Urine pregnancy
test to confirm . As u ve written u did pregnancy test on feb 22, it was not correct time to do urine pregnancy test as you got periods just 10 days before. If you have doubts you can get ultrasound
done. consult your doctor for further management. All the best.