Check and hearts?

Ashley • Avoiding pregnancy. 3 losses (6, 16, 15 weeks). 1 earth son, Lincoln born at 26 weeks. Just turned TWO & doing great!
On my big calendar some days had checks and other days have a heart I think? I'm assuming this was added with the update because I've never seen it... What does the hearts mean or whatever they are? Can't figure it out thanks!