AF for 1 day?! Still, BFN...

Hello, we have been trying for a while now but this time, something feels different:

My last AF was on the 6th of january, I ovulated on the 20th of january (according to opk), AF was supposed to arrive today (3rd of feb) and yesterday I had a bleeding like normal AF, but today, just little amount of brown residue and by the end of the day, maybe nothing at all.

FRER today still BFN, I had symptoms since 9 DPO (that day: pinching sensation on the right side of my uterus, appetite, nausea/indigestion, fatigue/sleepiness...) before that I already had boobs enlarged and sensitive.

My periods usually last around 5 days... with my first pregnancy I had no symptoms.

I don't ask you to tell me if I'm pregnant, but if any of you have an opinion on if it is still possible to be pregnant, when should I test again? It's frustrating to test everyday for BFN :(

Thank you very much for your time, and for all the ladies out there TTC: Tons of baby dust for us all!!! :D