Double Yolk Egg Superstition

My husband and I are TTC and this morning, he cracked open a double yolk egg! He has a twin sister and his mother always swears that any time she has cracked open a double yolk egg, she or a loved one was pregnant with twins! Any experiences with this? Could this be a good sign of pregnancy? (I am a strong believer in "God Winks", and we are all here for the same reason, so if you have any rude or negative comments, take them elsewhere. Thank you!)