With ICs I tend to use them with fmu then smu, and have tried afternoon and evening as well because they tend to be less obvious than other tests. With FRER I have seen my positives with fmu and during the afternoon and whilst the FRER I used four days before af was due was quite light, it was obvious. I know some people see good lines with ICs but I see more who see only faint lines. It's worth taking a look at the One Step reviews on Amazon if this is the brand of IC you have as a few have included photos