Dont panic, I know being on phase 3 stresses you out.. you almost feel like youre cheating but you arent!
As for the fruit mixed yogurts...especially with the fruit at the bottom, be very careful; lots of added sugars go into that.
You cant change what youve been doing but from here on just get your regular yogurt and add your own fruits, even try heating them up in a pan before mixing them so you get that "syrupy" texture you usually get with your yogurt that comes pre mixed with fruit. Only healthier.
Everyone has a different body and everyone responds differently.
Personally, I count greek yogurt specifically as dairy, no protein, and I was VERY concerned I was ruining everything but turns out, I even went down the first week! Just follow the instructions YOUR coach gave to you personally, because everyone is different!
Also, to clarify, you had 15 carbs fruit plus the 12 carbs? So a total of 27 carbs for fruit. 7 grams more than what is the max, depending on what you chose as your grains, who knows, but if they were way less than 30g maybe you'll even out??