Glimpse of hope - 5dp5dt?

Ok... I have to say that I officially HATE the dollar store tests now... Never again... I thought I'd test out my trigger(especially because I had 2 shots of Ovidrel) so if I get 2 lines, I will know it's a real BFP. Being cheap, I opted for the dollar store tests and I tested negative 3dp5dt and 4dp5dt.

So today is 5dp5dt and I thought I'd break out the good stuff and used a First Response. Well, behold!!!  2 lines!! Faint second line but definitely there, no question. I started crying and showed it to my husband who wonderfully pointed out that I should test with the dollar store one and if there is a line on that test, then he will officially believe I am pregnant. So I had some pee left and tested again with the cheapie... and... no line! (Well, maybe a ghost line but I wasn't entirely convinced that it was there...)

So what is it? Real BFP on the FRER or trigger shot still in the system picked up by the FRER but not the cheapie? Oh the torture!!! I want to be happy but I can't cause I don't really entirely believe it... I'm 12 days past my trigger shot today but I had 2 shots so has it left my system? Don't know...

*Frustrated groan*