PREGNANT OR NOt??

Sarah
Okay so last period was August 11th and I was supposed to have my period September 11th ish give or take a few days I had sex throughout the whole week (sept 5th-right up to when my period was due) I was fertile sometimes with condoms or some times with nothing and i was on top but he did not cum inside me.... it is now October 5th....
Had a hpt test and blood test both came back negative
What could it be?