The hook effect happens around 6 weeks and it's when the test line starts getting lighter than the control again. I freaked out because this happened to me. I was getting line stealers and then all of a sudden the test line was getting lighter and I went into meltdown.
So what u do is add half urine and half water and u shud get a nice dark result again
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Top test was just urine and bottom test was half urine and slightly just over half of water added to the urine and u can see a much darker result. So please don't worry hon if ure test line starts getting a bit lighter just add water to ure urine.
It's just that when u get to a certain stage of pregancy the preganacy test gets confused and will just throw out a lighter result it's because ure hormone levels are so so high.
Just thought as one who has experienced the hook effect wud share my experience of it.
Congrats again hon ure tests are looking fab. My FRER was just like ures at 5 weeks pregnant a complete line stealer and then a few days later the test line and control line were the same but did another and added water and bam. Another line stealer.