So confused

Stacey • Wife 👰 fur mama 🐶🐱 Nicu nurse 👩‍⚕️ Mom to a beautiful baby girl conceived through IVF

I took my trigger shot on Thursday and had <a href="https://glowing.com/glow-fertility-program">IUI</a> on Saturday. I was under the impression that the hcg from the trigger would be in my system for like 2 weeks but I tested this morning and the test was negative? I’m just confused because I thought it would show hcg still in my system. I only tested to see how much hcg was still in my system