My cousin had got into protected sex intimacy with her bf on 11-11-18 and she was expecting her periods on 28-11 but didn't get. On 6-12 she took a home pregnancy test kit from her first urine n show negative results and later on 11-12 she again tested from first urine and shows negative again. Also she is not feeling to have any of changes in her body. What other reason could. And please also tell when first month of pregnancy suppose to start (if happens) she was also having her 3 govt. Job exams in November month and last was on 29-11. What could be the other reason?