Could I be pregnant? Give me your opinions!

Hello everyone. I had unprotected sex 2 and a half weeks ago. He came inside of me two time's. My period is now 4 days late, which is odd as it usually comes early. I read online that you are the most fertile two weeks before your next period is due which is when it happened. He hadn't had sex in a few months and came quite a lot. I've been incredibly tired 24/7, and find myself yawning and sleepy even after a full day of resting. My nipples hurt slightly to the touch, and for the past maybe 2 days I've had a weird feeling in my stomach. Earlier today the smell of my friend's cooking made me feel incredibly nauseous. I called ClearBlue and they told me to wait until Sunday morning to take a test as anything earlier would be inaccurate. Not knowing me is killing me inside so I'd like to know everyone's view on my situation, (my last period started on the 21st of July).