BBT - 20DPO

Hi guys

I decided this month to bbt its my first time doing it so I haven’t one to compare it to, according to the graph I ovulated on the 8th which is true coz I also did a test and again it says I’ve implanted on the 19th am I right upto now ? Ok so my period was due on the 23rd of which I didn’t get BUT I’ve had a 2 day light bleeding (not my usual pms bleed) 25th & 26th as you can see my temps have all stayed high I feel dizzy and headaches and my stomach feels solid and so heavy I’ve tested and they are all BFN the app said I will be (if I’m pregnant) 4wks 4 days I’m 44 years old do you think it is still to soon for me to test positive or am I actually not pregnant 🤔

This is my chart if someone can explain it to me pls x