STUPID QUESTION, Please no hate, just need help!! 😭😭😭

Okay so my bf and I had unprotected sex a couple weeks ago. He did not even come close to finishing inside me. I know for a fact I was not in my fertile window, but this particular instance of sex happened three days before my window was supposed to begin. Lately I’ve been overly fatigued- usually I can get up right away in the mornings- but lately I’ve just wanted to sleep forever. I’m cramping, and it is a week before my period is supposed to begin, but I neeevvverr cramp this early. Other than that everything is fine (although I did go to the ER for chest pain last Friday (they said it was stress creating tension in my chest)). Anywho my question is, if I had sex outside of my fertile window (I know sperm can survive in the vajayjay for five days or so) and I feeling a little off two weeks later, could I be preggers? I wanna hear input before I go buy a pregnant test again and waste $17. Poor college student here!!

Disclaimer: please no hate. No ‘why aren’t you on birth control.’ Birth control doesn’t do well with me medically. And we use condoms. Just this one time we didn’t. Thanks guys!