iPhone XS maximum battery capacity down to 97% in less than 2 months

I bought my iPhone XS on 15th July 2019. I checked my battery health last night and it showed maximum battery capacity at 97%. This is a 3% fall in less than 2 months! Is this normal or should I get it checked? Also, I bought my iPhone in the US but I am currently using it in India. I believe it is covered in India under Apple's international warranty, right? Thank you for your help.