(one's) heart leaps
One feels a flutter in one's chest or stomach from happiness or excitement. I swear, my heart leaped the first time I saw my wife. My heart leaps every time I think of moving to Ireland next month.
your heart ˈleaps
used to say that you have a sudden feeling of happiness or excitement: Her heart leapt when she heard a knock on the door, thinking it might be him. OPPOSITE: your heart sinks