Are any of these positive??

Brooke

Can anyone with experienced eyes give me some insight? CD 19 probably looks the darkest but I forgot to take a picture until at least 5 mins after so idk how accurate it really is. CD 15 I had brown spotting in the morning when I wiped. CD 18 I had light pink/brown once when I wiped. It looked exactly like the implantation bleeding I had with my first (but ended up losing). And I’ve never before had spotting around ovulation or before AF.