Thank-you notes let you express your appreciation to those who were kind enough to send wedding presents. These notes also let the recipients know you have received the gifts they sent. You should send thank-you notes as soon after the wedding as possible. The note will seem more sincere if sent in a timely manner. Wedding thank you notes can match your wedding invitations. Referred to as informal notes, they are actually quite formal notes. Your monogram is usually blind embossed or printed in a conservative color on the front of the notes, or your full married name is centered on the front.
You certainly may send thank-you notes before your wedding. Sending them as you receive the gifts is a courtesy to the people who sent the gifts and also cuts down the number you'll need to send afterwards. However, remember if sent before the wedding, you still need to use stationery printed with your maiden name or monogram.

