I shouldve stopped testing

So I'm 5w1d today. I had a whole bunch of the Wondfo extra sensitive test strips left after i got my BFP so obviously I have been tracking my progression. Yesterday my test was as dark as it could be without being a dye stealer. I should have just stopped there, but I had one left. I tested today and the line is lighter... Now I don't know if my HCG has actually dropped, or if these Wondfo strips just maxed out. I have read they are not good for progression lines. Now i am scared and freaking out... I had 3 losses last year and thought for sure this pregnancy was it. Ugh... Idk what to do.