Did this happen to you?

I finally found out I was pregnant and went to the doctor, I had blood work done and it was confirmed! This all happened last week.

So yesterday and today (just to use them up), I took my last two pregnancy tests. Well the line is now lighter. Last week, when I was taking the tests, it was as dark as dark can be. But now, it’s lighter - still clearly visible, but lighter. Yesterday, when I wiped, it was light pink on the toilet paper. It was ever so slight and only happened once.

Is this normal? Just wondering why the test would get lighter.