Unmedicated IUI - CD 34 - no AF and BFNs

Hi all

Looking for some advice. I had my first <a href="https://glowing.com/glow-fertility-program">IUI</a> on 2/14/18 so I’m 20 dpiui. My cycles are typically between 26 and 28 days making me between 6 and 8 days late for AF with no signs of her coming. I’ve never had a missed period and it usually comes like clockwork every month. I’ve had some nausea, light cramping and creamy CM but otherwise nothing too significant. All tests are coming back BFNs. I didn’t take any medications as we opted for the natural cycle. Anyone have any idea of what’s going on? Stress? Concerns for ectopic? I don’t know what to do from here.

Thank you for any feedback!