Iui trigger or bfp?

Top pic is 10dpo and 12 days post trigger and bottom is one day later (13 days post trigger). For those of you who have had <a href="https://glowing.com/glow-fertility-program">IUI</a> with trigger shot do you think this is residual hcg from trigger or true bfp? The line doesn’t look like it got any darker from yesterday.