All the pics you have posted I would call BFPs if they were mine. I wouldn't worry about a different brand being BFN. They vary so much. Maybe a FRER would give you a nice clear line that would hive you more confidence?
Congrats! How special to conceive naturally after IVF!!
Yes we have a b&m but don't think I've seen hpts in there. Are the the little strip tests? Or do they have a proper case? Xxx