For my wedding party I had originally planned on having 3 bridesmaids. 2 close friends and then my fiance's sister. Well, my fiance's sister is pregnant and decided that it would be best that she is not in the wedding. Now I'm trying to decide if I should ask another friend or just stick with the two I have and have the parties be uneven. I have a good friend in mind but I don't want it to seem like she is a "replacement." I feel like I would be asking her just because my fiane's sister couldn't be in it, which is partially true. (We were going to have 4 each, but on groomsman is going to be out of town so we changed it to 3 before asking anyone) Should I ask her or not? If so, how should I explain this?