Im 22 Years Old. I Had Unprotected Sex On August

Im 22 years old. I had unprotected sex on August 9th and missed my period that month which was soppose to come on August 21st. I didn't really worry but this month i had unprotected sex once again and i still haven't gotten my period. I haven't taken a pregnancy test because the guy i had sex with Ejaculated outside and not in me, should i still take a pregnancy test? What are the chances that i might be pregnant? I also have been super stressed thats one of the reasons why i haven't token a pregnancy test but now im scared what do you recomend me to do?