hi, im 20 years old,, classes just started on june 15,im 1 week delayed supposedly last june 16 i should have but it didnt came and on june 20 i got sick and im taking antibiotics since june 22 till now and still no menstrual period,, do you think being sick or takig antibiotics delay my period? or am i stress also because of my sickness while in school?,, i tried home pregnancy kit and it is negative, i feel so paranoid or whatsoever but my upper abdomen just below and center of my breasts is hard.. please do help me with this.. thanks