Anyone? Ease my anxiety 😢

Here is a 3D I received today of our sweet baby. 13 weeks and 1 day. We weren’t scheduled for an ultrasound but the doctor couldn’t get the heart beat on the Doppler at first we decided to check baby out. Heart beat was great baby was moving around everywhere so that’s amazing.

Anyway, since then I have not stopped looking at the back of its head that bump near the bottom close to the neck. (Even couldn’t stop looking during the ultrasound I don’t know why I didn’t just ask him)

I know these things make babys look weird but I’m embarrassingly so worried. Anyone know anything about this is it’s normal? 😢