Not getting darker..

Tiffanie

Hey I tested positive on Saturday, 12 days post <a href="https://glowing.com/glow-fertility-program">iui</a>. Line is not getting progressively darker and I’m worried this is indicative of chemical or eptopic. Although it’s clearly positive, is the line supposed to get progressively darker? I’m now 4 days after missed period. Please help. Hcg was 80 15dpo. I go Saturday to see if doubling.