Negative tests but I feel pregnant

Marlene
This was my first month of trying via <a href="https://glowing.com/glow-fertility-program">IUI</a>. I am now 14 days past the procedure and maybe 12-13 dpo. I have been feeling mild cramping on and off for these two weeks, has some consistent white cervical mucus discharge, and my wife swears I have been moody!!! But I have had three negative tests now on day 8, 10, 12 and now day 14. :( AF is due Saturday. Maybe I am one of the women that won't test positive until after AF is due?