The definition of a maid in the Merriam-Webster dictionary is “an unmarried girl or woman especially when young”. It’s then logical that the young women attending a bride on her wedding day are called bridesmaids. Traditionally, they were chosen from unwed young women of marriageable age.

But what if they are already married?

BridesMaid

Interestingly, when a maid of honor is married, she’s called a matron of honor instead.

Does it mean that we should call a married bridesmaid a bridesmatron

This is technical correct, but the word bridesmatron is so antiquated and makes the woman sound so old that it’s never been used. 

In short, don’t worry, you can be married when your best friend gets married, and you’ll still be called a bridesmaid!