Pregnancy test slighter lighter today than it was yesterday

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Hi! I am 15dpo today and have been testing every day since I found out I was pregnant. I miscarried in 2021 and it scarred me. Here it a picture of my tests at 14 dpo and today at 15dpo. Today’s is a bit lighter. Should I be concerned?

The top test is 14dpo and the bottom is 15dpo.

Thank you