Weird line progression? Help!

So I’ve been testing Morning and evening because I have a box full of easy@home tests that I might as well use..Lol… anyways, my lines have been progressing great and yesterday I was 18DPO and I had my darkest line yet. It was as dark as the control line. But come the evening, my line was lighter. So I test again and then I got a bit of a darker one (more similar to the one I had in the morning). I did some googling and came across some people saying if you have a lot of HCG in your urine, sometimes it can make the test lighter so if dilute your urine it can give you a better result. So this morning at 19DPO I test twice. One with just the urine and one with the same urine diluted and it was super dark again! But I feel like it’s early for HCG to be that high… anyone else have this?