HPT Negative after IUI? Is it too soon to test?

Trigger Shot - 6/29
IUI - 7/1
Progesterone test - 7/8 - results "above 20"
HPT - 7/10 - BFN (cheap dolloar test)
Beta - scheduled for 7/15

I'm 10dp trigger and 8dp IUI.  Now that I know the HCG is out of my system with the negative hpt do I still have a chance at getting a BFP???  I am still haveing pregnancy sypmptoms, sore niples, slightly hardened abdomen and slight cramping. My period is irregular so I have no idea if AF will arrive on it own but I normally get no symptoms prior to AF.  Is this a good sign that I may possibly be pregnant?  


Any advice is greatly appreciated!

Good louck to all who are TTC!!!!