Great about the weight loss! Congrats!
As for the ACV, it is one of the things my acupuncturist recommends me taking while TTC because it alkalizes the body making a more hospital environment for embryos. But, taking ACV during pregnancy has not been researched so during the 2ww you should ask your doctor if it is safe to take. I would guess in moderation it is fine. What you don't want to do is continue losing weight if you suspect you are pregnant! Hopefully you'll be gaining another 25+ pounds shortly!
Good luck!