Pregnancy symptoms but several negative test

Ok so here it goes. I had unprotected sex several times in between Aug 2&3 with my SO. According to the app my ovulation day was Aug 7th. About a week after I had nausea with no vomiting did 5 days straight and excessive salivation. I’ve had crazy ass mood swings as well. I cried one day for no reason out of the blue. My expected period start date was today. On Aug 19th two days after a car accident I started spotting with a super light flow. So light I didn’t even fill an overnight pad in one day. The flow stopped and I have sporadic spotting. Mostly after I pee and wipe now. It’s day 3 since it originally started. I’m not cramping but I felt some weird sensations to the side of my boobs. I’ve taken 8 failed test between the onset of the nausea and yesterday. I had a beta test taken yesterday and it was negative. Oh I forgot I’ve been having a lack of appetite and food aversions too. Like coffee which I drink almost daily was making me queasy.

The nurse who discharged me said she had a failed blood test a week before a urine test confirmed that she was indeed pregnant. I have a coworker in the same boat she took 15 at home test all negative and then a blood test too which also came back negative. A week later she found out she was 5 weeks pregnant. She told me she had spotting and even a full period before the test came back.

I’m worried because I’m supposed to get a mri done because of my accident but I refuse to get one without knowing for sure that I’m not pregnant because these symptoms aren’t making any sense otherwise.