No AF but no +

This is our first month TTC and I was due for AF 6 days ago. I have never missed a period in my life and I'm never this late, however, I have taken 4 tests that have all been negatives. I'm not sure what to do since I'm pretty sure you need a cycle to TTC... 🤔 so weird this has never happened to me. Is it possible that it's just not showing up on the tests this far past my period date but that I am pregnant? Has this happened to anyone else?