Jennifer Lopez feared her daughter Emme was seriously ill after discovering a lump on the child’s head when she was just three weeks old.

The singer-and-actress — who raises 15-month-old twins Max and Emme with her husband Marc Anthony –says she was terrified after making the discovery.

“We both got very nervous, very, very nervous, and I just remember my heart sinking to my feet. I looked at Marc and I said, ‘You know if anything happens, I’m not going to be OK, you know that right?’” the 39-year-old star told E! at the Noche de Ninos Gala Benefit for Children’s Hospital Los Angeles on Saturday.

“Luckily in the end, she turned out fine,” Jennifer added.