16 DPO no AF.

Jennifer
I had my 3rd <a href="https://glowing.com/glow-fertility-program">IUI</a> 11/13 (lucky Friday the 13th). I'm currently 16 DPO and was suppose to start my dreadful cycle this past Friday, key word being suppose to. I'm never late and I've taken 2 tests, one Friday and one today, both were negative. I have zero signs of Aunt Flow showing her ugly face. I'm slowly driving myself crazy. Has anyone had a similar situation?