14/15dpo bfn?

So I'm driving myself crazy!

I'm pretty sure I ovulated on 2/8. Had pos opk 1st and 2nd and terrible pains on the 2nd. This was on cd18 as my last AF was 16th July (first one since I miscarried end of May)

Did the deed 1/2/3 August.

I'm now 15dpo (i think) and took this test last night. I'm sure I could see a faint line within the time limit. These are supposed to be super sensitive test too!

Did another test this morning and can't see anything :(

Surely it'd be showing positive by now. I have no idea when next AF is due either.

Need help!! Thank you