It's a personal option. It's YOUR wedding, do what YOU want to do. My mom was Catholic when she was married, and her mother DID NOT let her wear a white wedding dress (It was purple, and I think it looked much better than a white one

). If and when I have a wedding, I'm definitely wearing a white dress, when I'm CLEARLY NOT a virgin (I'm pregnant

)
It's not her choice on what color your dress is. I've known women with a couple kids wear a white dress (my mom included). So again, it's personal choice and is YOUR wedding.