Hello there, last month my period was 5 days late then came and this month I am 9 days late other then that I have a strict 27-28 day cycle. HPT was negative at a mid day testing and cheap test. Experiencing some on and off abdominal pains..not cramp like. No weight gain or loss, no stress, cannot think of why this is happening. Did have 24 hour flu bug the day of expected period would that effect me for this long? Thank You.