Yeah, the gulps are pretty normal. I was just watching my pastel het pieds pipping this weekend, and they all went through a pretty pronounced heavy breathing stage while still in the egg.
Is he still in the egg? A picture of the umbilicus over his head would be helpful. I wouldn't panic unless everyone is out of the egg tomorrow and he's still in there. If he doesn't exit within 6 hours of the last sibling, then yeah, I'd pull him out and have a look.