Faint lines not getting darker- 12 DPO

Hi everyone! So I had my medicated IUI November 25 (triggered on November 23). I got a vvfl 4 days ago and it is not getting darker. In fact no line has been as dark as the first from 10 DPO (top in photo). All have been FMU. The bottom two are both from today, morning urine without anything to drink but 2 hours apart. Today I am 12 DPO, I feel like if I’m really pregnant they should be getting darker. And I suppose it could still be the ovidrel that I thought I tested out but really didn’t. I know I’ve still got until 14 DPO, but I would love your thoughts!