Woke up to newborn choking up!?

Okay so my baby boy is 2 weeks old now. When he sleeps or lays downs, I can hear him breathe and sometimes it seems like he cant breathe well. Well, last night I woke up to him choking uo and coughing. It was the scariest thing ever. I don't really know what's wrong and I just want to make sure he will always be fine. I'm scared to just sleep now. Any ideas on how to help this?):