12 days post IUI, HPT showing negative...

Danielle • Canadian. Married. Registered Nurse. TTC x 3 years. 2 negative IUI :(
Getting a bit frustrated I guess. I had my hcg trigger shot back on the 21st at 4:00 am. I had my <a href="https://glowing.com/glow-fertility-program">IUI</a> on the 22nd at around 3:30 pm. I go back to see my dr. On the 8th which will be 16 days post <a href="https://glowing.com/glow-fertility-program">IUI</a>. I wanted to see how long it would take the trigger shot to get out of my system. So I took a few HPT early on and they were positive. Around day 9 they started to come back negative. Day 12 today and still negative.
I think my mind is playing tricks on me because sometimes I feel cramps and breast tenderness. Definitely bloating but I was attributing that to the progesterone. 
Anyone have any luck with positive HPT after day 12?