I’m so scared. 4 weeks 4 days

My test 2 days ago was super dark and I just took one this morning with first morning pee and it’s so much more faint?? My nipples also aren’t as sensitive as they were the previous day. I don’t have ANY spotting or bleeding this is my first pregnancy and idk what to do or if I need to be concerned or if maybe it’s the “hook effect”? I plan on taking some tests a little later in the day to see if there’s any change, praying this baby is okay

Okay update at 9:48am I took an easy@home test and the line is still just as dark, did a little research and apparently biotin can make a first response test line lighter! (Top photo is the new test)