Hi, I had sex around the 25 of last month

Patient: Hi, I had sex around the 25 of last month and have taken three pregnancy test, the first one a week after the next at 10 days after and the next 14 days after all three results where negitive, I have my fifth year exams coming up and I’m stressed about both my exams and the chance of being pregnant, I think my period is late as I’m sure it was due around the 30th of last month but I cant be one hundred percent sure but is it possible my period is late due to stress and not a pregnancy I don’t have any early pregnancy symptoms. please help

Symptoms: Non

Doctor: