hcg trigger shots

Well,
I noticed that the hpt test I took yesterday is lighter than the one I took today.  I am only 8 days past hcg trigger and 7dpo.  I am on estradoil and progesterone and have terrible bloating/constipation.  Ugh!  I am usually very regular (tmi).

I expect there to be a + line because of the hcg shot but should it be getting darker?  I took the one test on Saturday at 2pm but had not peed in a couple hours.  The one I took this morning, I had peed about an hour before and it was still darker.

Anyone else ever experience this.