If you did IUI on D15, you likely ovulated around D14-15, so on D22 you’d be roughly 7-8 DPO. For BFP (positive test), implantation usually happens around 6-12 DPO, and hCG takes a few more days to build up enough to show on a test. Testing now at 7-8 DPO is usually too early and may give a false negative. Best to wait until at least 12-14 DPO (around D27-29, basically when your period is due) for a more reliable result. I know the wait is torture, but testing too early just leads to unnecessary stress. Sending baby dust your way! 🤞