Ok, ladies, how long after noticing IB can you test and get BFP?!

Elizabeth • Momma to three beautiful children, 8 years, 5 years and a newborn. 😍
I am 8 dpo today... Noticed what I am thinking could totally be IB yesterday <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>.