Battery condition

Hello all.

I bought my iPhone last week. I’m not the first owner but the previous bought phone in February 2020. One week ago the battery condition was 95% now I have 93%. Is it possible that the condition decrease 2% in one week ? I turned off my phone a few times during this time and have to charge one time per day. In relate to the battery should I contact with the warranty support ?

thanks in advance

Dominika