Trigger shot or positive?

Kelly • First born on 12/12/16 👩🏼👦🏿👶🏽🌈 August 2022: IUI #1 Success October: miscarriage

Top one was 14dpt

Bottom was today, 15dpt

Are we thinking this is trigger shot or getting darker? I used a different cheaper brand 12dpt and it was completely negative. My period should be due tomorrow as it will be 2 weeks since the IUI. I’m going to test in the morning which will be 16dpt and call my doctor. They said they will do blood work to confirm. I’ve been consistently nauseous since 12dpt.