Wow, Angelria! What a confusing time this must be with the possible faulty tests, yet I def see a faint second line. I would try the FRER. I've heard the CB digis aren't as sensitive that early. The FRER worked for me at 10dpo, then I used a dollar store one the next day and saw a line on it too. Maybe try the dollar store if you don't want to spend a bunch.
I really hope this is it for you and not a false positive!!! Do you feel any different or anything??