Heart Letter Tamagotchi p?

I didnt get to see it all but my tamagotchi screen came on and there was a big letter with like a heart on it and i think orange background with more hearts, and i cant find anything it did and i dont have it as like an item? EDIT: I thought it would also be good to note my tamagotchi is an adult female Yukinotchi. Also right after i went to feed her at the restaurant and antoher tamagotchi came up and started talking and then they ate a huge plate of food. a ton of weird things are happening right not and i cant read japanese xD Esit 2: it happened again and i got some pictures, i didnt get it of the envelope though i wasnt fast enough.

Today is Atchitchi's birthday! On a Tamagotchi's birthday you get a card to celebrate and you can visit them at the restaurant for a birthday feast!