Odd Symptoms - help!

Hello!

Thanks in advance if you are reading my post. I am about 3 days away from AF and convinced I am pregnant. I'm confident that I had implantation bleeding and it corresponded with a dip in my BBT. I still haven't gotten a BFP even with an early response test. I do have some odd symptoms but not the traditional ones like sore breasts (they don't look or feel different at all). I'm just curious if anyone else has experienced any of these and if so, were you pregnant?

-nausea about 4 DPO but has since gone away

-light brown spotting for the past few days

-darker brown spotting day after BD

-chronic exhaustion and headache

-uncharacteristic acne

-bloating and gas (sorry, TMI)

-mild cramping in what feels like left ovary

-as of today, pain in my lower back, butt and thighs (it feels like I worked out for hours and pulled a muscle)

-a weird "I just feel different" feeling

I am moderate endometriosis and we miscarried a few months ago. I'm not sure what to think but definitely feel off. I really thought I would have a BFP but now I'm second guessing.

Thanks!