Umbilical hernia - when to worry?

Daughter is 6 week old. The pediatrician was not worried when she saw the umbilical hernia two weeks ago, but I think it may have gotten bigger since then? We don't have another appt for three weeks.

Does this look like a normal umbilical hernia? Should we go in before our scheduled appt?

I don't know, I'm a FTM and a worrywart.