period

Kourtney
So I've been on the implanon for I think 2 years now at least, anyways I use this <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> App to track when to expect my next period and when my periods are going to end. Well today I went to the bathroom and light pink reddish color showed on the toilet paper, but when I wiped again it was clear. 
Idk what's going on exactly 
And <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says I should be getting my next period in 13 days now.
 I'm 22 years old. 
My boyfriend and I have sex usually on a daily basis. 
Any explanations?