What is this again ... sorry Tim pic included.

I'm having no cramps. At all. And this happens only when I wipe. No even on my panty liner. No blood clots. No even coming out in the toilet. Like I said only when I wipe. And a very tiny bit. No blood. Just this Brownish color. I'm 18 dpo. And haven't started af. I'm actually going on 4 days late.