Home pregnancy test getting lighter

I’m currently 7+3. Before I got pregnant, I ordered a big box of ovulation and pregnancy tests. Since I found out I have been testing on and off (mostly just for piece of mind) but also just because I have so many extra. I took one today and the test is significantly lighter, still positive but not as dark as it has been. Just curious if anyone else has had this. My first appointment isn’t until 10+2.