Need serious input on this situation.

Okay so, 9dpo I took two wondfo dip strip tests and both had SUPER faint positives that came up after about 8 minutes. They were pink colored, not grey. 10 dpo I took my last test and it was stark white negative with fmu. I'm now 3 days before my period, and 11 dpo.  I don't want to was the money on a pack of Frer's because they are so expensive and I have spent so much money on them and have always wasted them on negatives. My question is: has this ever happened to anyone else and it resulted in a bfp later on?