I tried to look for something like this the other day so figured I’d post my experience- The amazon pregmate cheapies do not seem to turn to total dye stealers (if they do it must be really late). The last strip and last FRER is taken the same day. I mildly panicked when my strips weren’t getting darker but took the FRER And my mind was at ease! I’ll also stop testing now because my husband prob thinks I’m psycho and I’m starting to agree with him 🙈