Fading BFP, w/IUI what does this mean?

40, ttc #1-I tested 8dpiui. Got a BFP, tested again today and not it's a vvf BFP. I tested again bc 1. That's what we all do when u get a BFP. Lol 2) bc I was afraid that the Trigger shot was still in my system and it was a false positive. 
I'm now on cd22, 10days after my trigger shot, 9dpiui What do you guys think this means??! Just give it to me straight. 
The top test is from this AM, the bottom 22hrs before.