If Having Unprotected Sex A Week And Half Before Your

If having unprotected sex a week and half before your due cycle, will you start having symptoms that early? My cycle is late based off of last months first day of my cycle. Pregnancy test are negative because its too early I assume. Should I get a blood test or wait it out? What is the reason for sore breast? What is the reason for being fatigued to the point of being super exhausted?