IM DELAYED, please HELP ME

Patient: My first day of last menstruation was last July 9, 2015 and til now i got no period.i took pt, many times and result is negativeis there any possibility that i am pregnanti was admitted aug 1 due to gastritis acute gastroenteritis with moderate dehydration and from then , i have given these kind of meds omeprazole, buscopan (both ivtt) dicycloverine, ensomeprazole 40mg , ganaton, levofloxacin and amoxicililnare there any effects on that if im possitive or is it one factor why i still gotten my period

Symptoms: No symptoms

Doctor: